Mysql 从文本解析时间间隔_Mysql_Sql

Mysql 从文本解析时间间隔

mysql sql

Mysql 从文本解析时间间隔,mysql,sql,Mysql,Sql,我有以下数据： +-------------+----------------------------+ | name | time_lost | +-------------+----------------------------+ | Break000002 | 7 day 18.0 hours | | Break000003 | 0 day 10.0 hours | | Break000004 | 1

我有以下数据：

+-------------+----------------------------+
| name        | time_lost                  |
+-------------+----------------------------+
| Break000002 | 7 day 18.0 hours           |
| Break000003 | 0 day 10.0 hours           |
| Break000004 | 1 day 1.52 hours           |
| Break000005 | 2 day 21.0 hours           |
| Break000006 | 1 day 0.416666666667 hours |
| Break000007 | 0 day 1.25 hours           |
| Break000008 | 0 day 2.5 hours            |
| Break000009 | 1 day 0.02 hours           |
+-------------+----------------------------+

SELECT TRIM(SUBSTRING_INDEX(TRIM(REPLACE(REPLACE(time_lost, 'day', ''), 'hours', '')), ' ',-1))

| Break000002 | 18.0           |                    
| Break000003 | 10.0           |                    
| Break000004 | 1.52           |                    
| Break000005 | 21.0           |                    
| Break000006 | 0.416666666667 |                    
| Break000007 | 1.25           |                    
| Break000008 | 2.5            |                    
| Break000009 | 0.02           |

-- Days as unsigned integer                    
SELECT CAST(TRIM(SUBSTRING_INDEX(TRIM(REPLACE(REPLACE(time_lost, 'day', ''), 'hours', '')), ' ',1)) AS UNSIGNED)                    

-- Hours with 2 digit precision                                                       
SELECT CAST(TRIM(SUBSTRING_INDEX(TRIM(REPLACE(REPLACE(time_lost, 'day', ''), 'hours', '')), ' ',-1)) AS DECIMAL (2,2))

我想计算此表中损失的总时间，因此我尝试了以下方法：

select sum(time_lost) from mytable;

SELECT TRIM(SUBSTRING_INDEX(TRIM(REPLACE(REPLACE(time_lost, 'day', ''), 'hours', '')), ' ',-1))

| Break000002 | 18.0           |                    
| Break000003 | 10.0           |                    
| Break000004 | 1.52           |                    
| Break000005 | 21.0           |                    
| Break000006 | 0.416666666667 |                    
| Break000007 | 1.25           |                    
| Break000008 | 2.5            |                    
| Break000009 | 0.02           |

-- Days as unsigned integer                    
SELECT CAST(TRIM(SUBSTRING_INDEX(TRIM(REPLACE(REPLACE(time_lost, 'day', ''), 'hours', '')), ' ',1)) AS UNSIGNED)                    

-- Hours with 2 digit precision                                                       
SELECT CAST(TRIM(SUBSTRING_INDEX(TRIM(REPLACE(REPLACE(time_lost, 'day', ''), 'hours', '')), ' ',-1)) AS DECIMAL (2,2))

输出：

+----------------+
| sum(time_lost) |
+----------------+
|             12 |
+----------------+

SELECT TRIM(SUBSTRING_INDEX(TRIM(REPLACE(REPLACE(time_lost, 'day', ''), 'hours', '')), ' ',-1))

| Break000002 | 18.0           |                    
| Break000003 | 10.0           |                    
| Break000004 | 1.52           |                    
| Break000005 | 21.0           |                    
| Break000006 | 0.416666666667 |                    
| Break000007 | 1.25           |                    
| Break000008 | 2.5            |                    
| Break000009 | 0.02           |

-- Days as unsigned integer                    
SELECT CAST(TRIM(SUBSTRING_INDEX(TRIM(REPLACE(REPLACE(time_lost, 'day', ''), 'hours', '')), ' ',1)) AS UNSIGNED)                    

-- Hours with 2 digit precision                                                       
SELECT CAST(TRIM(SUBSTRING_INDEX(TRIM(REPLACE(REPLACE(time_lost, 'day', ''), 'hours', '')), ' ',-1)) AS DECIMAL (2,2))

我的问题:

SELECT TRIM(SUBSTRING_INDEX(TRIM(REPLACE(REPLACE(time_lost, 'day', ''), 'hours', '')), ' ',-1))

| Break000002 | 18.0           |                    
| Break000003 | 10.0           |                    
| Break000004 | 1.52           |                    
| Break000005 | 21.0           |                    
| Break000006 | 0.416666666667 |                    
| Break000007 | 1.25           |                    
| Break000008 | 2.5            |                    
| Break000009 | 0.02           |

-- Days as unsigned integer                    
SELECT CAST(TRIM(SUBSTRING_INDEX(TRIM(REPLACE(REPLACE(time_lost, 'day', ''), 'hours', '')), ' ',1)) AS UNSIGNED)                    

-- Hours with 2 digit precision                                                       
SELECT CAST(TRIM(SUBSTRING_INDEX(TRIM(REPLACE(REPLACE(time_lost, 'day', ''), 'hours', '')), ' ',-1)) AS DECIMAL (2,2))

我如何解析这个字符串以将其转换为时间，请给我任何提示

SELECT TRIM(SUBSTRING_INDEX(TRIM(REPLACE(REPLACE(time_lost, 'day', ''), 'hours', '')), ' ',-1))

| Break000002 | 18.0           |                    
| Break000003 | 10.0           |                    
| Break000004 | 1.52           |                    
| Break000005 | 21.0           |                    
| Break000006 | 0.416666666667 |                    
| Break000007 | 1.25           |                    
| Break000008 | 2.5            |                    
| Break000009 | 0.02           |

-- Days as unsigned integer                    
SELECT CAST(TRIM(SUBSTRING_INDEX(TRIM(REPLACE(REPLACE(time_lost, 'day', ''), 'hours', '')), ' ',1)) AS UNSIGNED)                    

-- Hours with 2 digit precision                                                       
SELECT CAST(TRIM(SUBSTRING_INDEX(TRIM(REPLACE(REPLACE(time_lost, 'day', ''), 'hours', '')), ' ',-1)) AS DECIMAL (2,2))

谢谢

最简单的解决方案是首先将数据存储为时间单位。可能是分钟数，也可能是秒数，这取决于你需要测量的准确度

SELECT TRIM(SUBSTRING_INDEX(TRIM(REPLACE(REPLACE(time_lost, 'day', ''), 'hours', '')), ' ',-1))

| Break000002 | 18.0           |                    
| Break000003 | 10.0           |                    
| Break000004 | 1.52           |                    
| Break000005 | 21.0           |                    
| Break000006 | 0.416666666667 |                    
| Break000007 | 1.25           |                    
| Break000008 | 2.5            |                    
| Break000009 | 0.02           |

-- Days as unsigned integer                    
SELECT CAST(TRIM(SUBSTRING_INDEX(TRIM(REPLACE(REPLACE(time_lost, 'day', ''), 'hours', '')), ' ',1)) AS UNSIGNED)                    

-- Hours with 2 digit precision                                                       
SELECT CAST(TRIM(SUBSTRING_INDEX(TRIM(REPLACE(REPLACE(time_lost, 'day', ''), 'hours', '')), ' ',-1)) AS DECIMAL (2,2))

例如，如果您有分钟数，那么字段的“和”将给出所有行中的总分钟数，您可以通过执行适当的乘法或除法将其转换为小时/天/任何显示的时间-您可以在此处执行此操作，或者，在应用程序的表示层中可能更合适，最简单的解决方案是首先将数据存储为时间单位。可能是分钟数，也可能是秒数，这取决于你需要测量的准确度

SELECT TRIM(SUBSTRING_INDEX(TRIM(REPLACE(REPLACE(time_lost, 'day', ''), 'hours', '')), ' ',-1))

| Break000002 | 18.0           |                    
| Break000003 | 10.0           |                    
| Break000004 | 1.52           |                    
| Break000005 | 21.0           |                    
| Break000006 | 0.416666666667 |                    
| Break000007 | 1.25           |                    
| Break000008 | 2.5            |                    
| Break000009 | 0.02           |

-- Days as unsigned integer                    
SELECT CAST(TRIM(SUBSTRING_INDEX(TRIM(REPLACE(REPLACE(time_lost, 'day', ''), 'hours', '')), ' ',1)) AS UNSIGNED)                    

-- Hours with 2 digit precision                                                       
SELECT CAST(TRIM(SUBSTRING_INDEX(TRIM(REPLACE(REPLACE(time_lost, 'day', ''), 'hours', '')), ' ',-1)) AS DECIMAL (2,2))

例如，如果您有分钟数，那么字段的“和”将给出所有行中的总分钟数，您可以通过执行适当的乘法或除法将其转换为小时/天/任何显示的时间-您可以在此处执行此操作，或者，在应用程序的表示层中，它可能更合适。您可以使用以下分数将

time\u lost

列转换为天数：

LEFT(time_lost, LOCATE(' day', time_lost)-1) + SUBSTR(time_lost, LOCATE(' day', time_lost)+5)/24

SELECT TRIM(SUBSTRING_INDEX(TRIM(REPLACE(REPLACE(time_lost, 'day', ''), 'hours', '')), ' ',-1))

| Break000002 | 18.0           |                    
| Break000003 | 10.0           |                    
| Break000004 | 1.52           |                    
| Break000005 | 21.0           |                    
| Break000006 | 0.416666666667 |                    
| Break000007 | 1.25           |                    
| Break000008 | 2.5            |                    
| Break000009 | 0.02           |

-- Days as unsigned integer                    
SELECT CAST(TRIM(SUBSTRING_INDEX(TRIM(REPLACE(REPLACE(time_lost, 'day', ''), 'hours', '')), ' ',1)) AS UNSIGNED)                    

-- Hours with 2 digit precision                                                       
SELECT CAST(TRIM(SUBSTRING_INDEX(TRIM(REPLACE(REPLACE(time_lost, 'day', ''), 'hours', '')), ' ',-1)) AS DECIMAL (2,2))

然后将其放入

SUM（）

函数中

select sum(LEFT(time_lost, LOCATE(' day', time_lost)-1) + SUBSTR(time_lost, LOCATE(' day', time_lost)+5)/24) AS total_time_lost
from mytable;

SELECT TRIM(SUBSTRING_INDEX(TRIM(REPLACE(REPLACE(time_lost, 'day', ''), 'hours', '')), ' ',-1))

| Break000002 | 18.0           |                    
| Break000003 | 10.0           |                    
| Break000004 | 1.52           |                    
| Break000005 | 21.0           |                    
| Break000006 | 0.416666666667 |                    
| Break000007 | 1.25           |                    
| Break000008 | 2.5            |                    
| Break000009 | 0.02           |

-- Days as unsigned integer                    
SELECT CAST(TRIM(SUBSTRING_INDEX(TRIM(REPLACE(REPLACE(time_lost, 'day', ''), 'hours', '')), ' ',1)) AS UNSIGNED)                    

-- Hours with 2 digit precision                                                       
SELECT CAST(TRIM(SUBSTRING_INDEX(TRIM(REPLACE(REPLACE(time_lost, 'day', ''), 'hours', '')), ' ',-1)) AS DECIMAL (2,2))

示例数据的结果为

14.2638天

您可以将

时间损失

列转换为天数，分数如下：

LEFT(time_lost, LOCATE(' day', time_lost)-1) + SUBSTR(time_lost, LOCATE(' day', time_lost)+5)/24

SELECT TRIM(SUBSTRING_INDEX(TRIM(REPLACE(REPLACE(time_lost, 'day', ''), 'hours', '')), ' ',-1))

| Break000002 | 18.0           |                    
| Break000003 | 10.0           |                    
| Break000004 | 1.52           |                    
| Break000005 | 21.0           |                    
| Break000006 | 0.416666666667 |                    
| Break000007 | 1.25           |                    
| Break000008 | 2.5            |                    
| Break000009 | 0.02           |

-- Days as unsigned integer                    
SELECT CAST(TRIM(SUBSTRING_INDEX(TRIM(REPLACE(REPLACE(time_lost, 'day', ''), 'hours', '')), ' ',1)) AS UNSIGNED)                    

-- Hours with 2 digit precision                                                       
SELECT CAST(TRIM(SUBSTRING_INDEX(TRIM(REPLACE(REPLACE(time_lost, 'day', ''), 'hours', '')), ' ',-1)) AS DECIMAL (2,2))

然后将其放入

SUM（）

函数中

select sum(LEFT(time_lost, LOCATE(' day', time_lost)-1) + SUBSTR(time_lost, LOCATE(' day', time_lost)+5)/24) AS total_time_lost
from mytable;

SELECT TRIM(SUBSTRING_INDEX(TRIM(REPLACE(REPLACE(time_lost, 'day', ''), 'hours', '')), ' ',-1))

| Break000002 | 18.0           |                    
| Break000003 | 10.0           |                    
| Break000004 | 1.52           |                    
| Break000005 | 21.0           |                    
| Break000006 | 0.416666666667 |                    
| Break000007 | 1.25           |                    
| Break000008 | 2.5            |                    
| Break000009 | 0.02           |

-- Days as unsigned integer                    
SELECT CAST(TRIM(SUBSTRING_INDEX(TRIM(REPLACE(REPLACE(time_lost, 'day', ''), 'hours', '')), ' ',1)) AS UNSIGNED)                    

-- Hours with 2 digit precision                                                       
SELECT CAST(TRIM(SUBSTRING_INDEX(TRIM(REPLACE(REPLACE(time_lost, 'day', ''), 'hours', '')), ' ',-1)) AS DECIMAL (2,2))

示例数据的结果将是

14.2638天

首先使用替换功能2次以删除“天”和“小时”，然后修剪以删除前导空格和尾随空格

SELECT TRIM(REPLACE(REPLACE(time_lost, 'day ', ''), 'hours', ''))

SELECT TRIM(SUBSTRING_INDEX(TRIM(REPLACE(REPLACE(time_lost, 'day', ''), 'hours', '')), ' ',-1))

| Break000002 | 18.0           |                    
| Break000003 | 10.0           |                    
| Break000004 | 1.52           |                    
| Break000005 | 21.0           |                    
| Break000006 | 0.416666666667 |                    
| Break000007 | 1.25           |                    
| Break000008 | 2.5            |                    
| Break000009 | 0.02           |

-- Days as unsigned integer                    
SELECT CAST(TRIM(SUBSTRING_INDEX(TRIM(REPLACE(REPLACE(time_lost, 'day', ''), 'hours', '')), ' ',1)) AS UNSIGNED)                    

-- Hours with 2 digit precision                                                       
SELECT CAST(TRIM(SUBSTRING_INDEX(TRIM(REPLACE(REPLACE(time_lost, 'day', ''), 'hours', '')), ' ',-1)) AS DECIMAL (2,2))

因此，你将以这个结束

| Break000002 | 7 18.0           |
| Break000003 | 0 10.0           |
| Break000004 | 1 1.52           |
| Break000005 | 2 21.0           |
| Break000006 | 1 0.416666666667 |
| Break000007 | 0 1.25           |
| Break000008 | 0 2.5            |
| Break000009 | 1 0.02           |

SELECT TRIM(SUBSTRING_INDEX(TRIM(REPLACE(REPLACE(time_lost, 'day', ''), 'hours', '')), ' ',-1))

| Break000002 | 18.0           |                    
| Break000003 | 10.0           |                    
| Break000004 | 1.52           |                    
| Break000005 | 21.0           |                    
| Break000006 | 0.416666666667 |                    
| Break000007 | 1.25           |                    
| Break000008 | 2.5            |                    
| Break000009 | 0.02           |

-- Days as unsigned integer                    
SELECT CAST(TRIM(SUBSTRING_INDEX(TRIM(REPLACE(REPLACE(time_lost, 'day', ''), 'hours', '')), ' ',1)) AS UNSIGNED)                    

-- Hours with 2 digit precision                                                       
SELECT CAST(TRIM(SUBSTRING_INDEX(TRIM(REPLACE(REPLACE(time_lost, 'day', ''), 'hours', '')), ' ',-1)) AS DECIMAL (2,2))

然后使用子字符串_INDEX隔离天数（在找到第一个空格之前字符串的左部分）

SELECT TRIM(SUBSTRING_INDEX(TRIM(REPLACE(REPLACE(time_lost, 'day', ''), 'hours', '')), ' ',-1))

| Break000002 | 18.0           |                    
| Break000003 | 10.0           |                    
| Break000004 | 1.52           |                    
| Break000005 | 21.0           |                    
| Break000006 | 0.416666666667 |                    
| Break000007 | 1.25           |                    
| Break000008 | 2.5            |                    
| Break000009 | 0.02           |

-- Days as unsigned integer                    
SELECT CAST(TRIM(SUBSTRING_INDEX(TRIM(REPLACE(REPLACE(time_lost, 'day', ''), 'hours', '')), ' ',1)) AS UNSIGNED)                    

-- Hours with 2 digit precision                                                       
SELECT CAST(TRIM(SUBSTRING_INDEX(TRIM(REPLACE(REPLACE(time_lost, 'day', ''), 'hours', '')), ' ',-1)) AS DECIMAL (2,2))

这给了你这个

| Break000002 | 7|
| Break000003 | 0|                    
| Break000004 | 1|                    
| Break000005 | 2|                    
| Break000006 | 1|                    
| Break000007 | 0|                    
| Break000008 | 0|                    
| Break000009 | 1

SELECT TRIM(SUBSTRING_INDEX(TRIM(REPLACE(REPLACE(time_lost, 'day', ''), 'hours', '')), ' ',-1))

| Break000002 | 18.0           |                    
| Break000003 | 10.0           |                    
| Break000004 | 1.52           |                    
| Break000005 | 21.0           |                    
| Break000006 | 0.416666666667 |                    
| Break000007 | 1.25           |                    
| Break000008 | 2.5            |                    
| Break000009 | 0.02           |

-- Days as unsigned integer                    
SELECT CAST(TRIM(SUBSTRING_INDEX(TRIM(REPLACE(REPLACE(time_lost, 'day', ''), 'hours', '')), ' ',1)) AS UNSIGNED)                    

-- Hours with 2 digit precision                                                       
SELECT CAST(TRIM(SUBSTRING_INDEX(TRIM(REPLACE(REPLACE(time_lost, 'day', ''), 'hours', '')), ' ',-1)) AS DECIMAL (2,2))

使用子字符串_INDEX和负计数（-1），您可以隔离小时数（从末尾找到的第一个空格之前字符串的右部分）

SELECT TRIM(SUBSTRING_INDEX(TRIM(REPLACE(REPLACE(time_lost, 'day', ''), 'hours', '')), ' ',-1))

| Break000002 | 18.0           |                    
| Break000003 | 10.0           |                    
| Break000004 | 1.52           |                    
| Break000005 | 21.0           |                    
| Break000006 | 0.416666666667 |                    
| Break000007 | 1.25           |                    
| Break000008 | 2.5            |                    
| Break000009 | 0.02           |

-- Days as unsigned integer                    
SELECT CAST(TRIM(SUBSTRING_INDEX(TRIM(REPLACE(REPLACE(time_lost, 'day', ''), 'hours', '')), ' ',1)) AS UNSIGNED)                    

-- Hours with 2 digit precision                                                       
SELECT CAST(TRIM(SUBSTRING_INDEX(TRIM(REPLACE(REPLACE(time_lost, 'day', ''), 'hours', '')), ' ',-1)) AS DECIMAL (2,2))

这给了你这个

SELECT TRIM(SUBSTRING_INDEX(TRIM(REPLACE(REPLACE(time_lost, 'day', ''), 'hours', '')), ' ',-1))

| Break000002 | 18.0           |                    
| Break000003 | 10.0           |                    
| Break000004 | 1.52           |                    
| Break000005 | 21.0           |                    
| Break000006 | 0.416666666667 |                    
| Break000007 | 1.25           |                    
| Break000008 | 2.5            |                    
| Break000009 | 0.02           |

-- Days as unsigned integer                    
SELECT CAST(TRIM(SUBSTRING_INDEX(TRIM(REPLACE(REPLACE(time_lost, 'day', ''), 'hours', '')), ' ',1)) AS UNSIGNED)                    

-- Hours with 2 digit precision                                                       
SELECT CAST(TRIM(SUBSTRING_INDEX(TRIM(REPLACE(REPLACE(time_lost, 'day', ''), 'hours', '')), ' ',-1)) AS DECIMAL (2,2))

您还应该将结果转换为数字，因为它们实际上被视为字符串

SELECT TRIM(SUBSTRING_INDEX(TRIM(REPLACE(REPLACE(time_lost, 'day', ''), 'hours', '')), ' ',-1))

| Break000002 | 18.0           |                    
| Break000003 | 10.0           |                    
| Break000004 | 1.52           |                    
| Break000005 | 21.0           |                    
| Break000006 | 0.416666666667 |                    
| Break000007 | 1.25           |                    
| Break000008 | 2.5            |                    
| Break000009 | 0.02           |

-- Days as unsigned integer                    
SELECT CAST(TRIM(SUBSTRING_INDEX(TRIM(REPLACE(REPLACE(time_lost, 'day', ''), 'hours', '')), ' ',1)) AS UNSIGNED)                    

-- Hours with 2 digit precision                                                       
SELECT CAST(TRIM(SUBSTRING_INDEX(TRIM(REPLACE(REPLACE(time_lost, 'day', ''), 'hours', '')), ' ',-1)) AS DECIMAL (2,2))

现在你已经准备好进行计算了

SELECT TRIM(SUBSTRING_INDEX(TRIM(REPLACE(REPLACE(time_lost, 'day', ''), 'hours', '')), ' ',-1))

| Break000002 | 18.0           |                    
| Break000003 | 10.0           |                    
| Break000004 | 1.52           |                    
| Break000005 | 21.0           |                    
| Break000006 | 0.416666666667 |                    
| Break000007 | 1.25           |                    
| Break000008 | 2.5            |                    
| Break000009 | 0.02           |

-- Days as unsigned integer                    
SELECT CAST(TRIM(SUBSTRING_INDEX(TRIM(REPLACE(REPLACE(time_lost, 'day', ''), 'hours', '')), ' ',1)) AS UNSIGNED)                    

-- Hours with 2 digit precision                                                       
SELECT CAST(TRIM(SUBSTRING_INDEX(TRIM(REPLACE(REPLACE(time_lost, 'day', ''), 'hours', '')), ' ',-1)) AS DECIMAL (2,2))

一天，只需求和。在一个小时内，你必须把它们当作一小部分：天=小时/ 24＜/P>

SELECT TRIM(SUBSTRING_INDEX(TRIM(REPLACE(REPLACE(time_lost, 'day', ''), 'hours', '')), ' ',-1))

| Break000002 | 18.0           |                    
| Break000003 | 10.0           |                    
| Break000004 | 1.52           |                    
| Break000005 | 21.0           |                    
| Break000006 | 0.416666666667 |                    
| Break000007 | 1.25           |                    
| Break000008 | 2.5            |                    
| Break000009 | 0.02           |

-- Days as unsigned integer                    
SELECT CAST(TRIM(SUBSTRING_INDEX(TRIM(REPLACE(REPLACE(time_lost, 'day', ''), 'hours', '')), ' ',1)) AS UNSIGNED)                    

-- Hours with 2 digit precision                                                       
SELECT CAST(TRIM(SUBSTRING_INDEX(TRIM(REPLACE(REPLACE(time_lost, 'day', ''), 'hours', '')), ' ',-1)) AS DECIMAL (2,2))

SELECT ( 
         SUM(CAST(TRIM(SUBSTRING_INDEX(TRIM(REPLACE(REPLACE(time_lost, 'day', ''), 'hours', '')), ' ',1)) AS UNSIGNED))                                                             
       + SUM(CAST(TRIM(SUBSTRING_INDEX(TRIM(REPLACE(REPLACE(time_lost, 'day', ''), 'hours', '')), ' ',-1)) AS DECIMAL (2,2)) / 24 )
       ) AS total_days

编辑：有点太晚了

首先使用“替换”功能两次以删除“天”和“小时”，然后修剪以删除前导和尾随空格

SELECT TRIM(REPLACE(REPLACE(time_lost, 'day ', ''), 'hours', ''))

SELECT TRIM(SUBSTRING_INDEX(TRIM(REPLACE(REPLACE(time_lost, 'day', ''), 'hours', '')), ' ',-1))

| Break000002 | 18.0           |                    
| Break000003 | 10.0           |                    
| Break000004 | 1.52           |                    
| Break000005 | 21.0           |                    
| Break000006 | 0.416666666667 |                    
| Break000007 | 1.25           |                    
| Break000008 | 2.5            |                    
| Break000009 | 0.02           |

-- Days as unsigned integer                    
SELECT CAST(TRIM(SUBSTRING_INDEX(TRIM(REPLACE(REPLACE(time_lost, 'day', ''), 'hours', '')), ' ',1)) AS UNSIGNED)                    

-- Hours with 2 digit precision                                                       
SELECT CAST(TRIM(SUBSTRING_INDEX(TRIM(REPLACE(REPLACE(time_lost, 'day', ''), 'hours', '')), ' ',-1)) AS DECIMAL (2,2))

因此，你将以这个结束

| Break000002 | 7 18.0           |
| Break000003 | 0 10.0           |
| Break000004 | 1 1.52           |
| Break000005 | 2 21.0           |
| Break000006 | 1 0.416666666667 |
| Break000007 | 0 1.25           |
| Break000008 | 0 2.5            |
| Break000009 | 1 0.02           |

SELECT TRIM(SUBSTRING_INDEX(TRIM(REPLACE(REPLACE(time_lost, 'day', ''), 'hours', '')), ' ',-1))

| Break000002 | 18.0           |                    
| Break000003 | 10.0           |                    
| Break000004 | 1.52           |                    
| Break000005 | 21.0           |                    
| Break000006 | 0.416666666667 |                    
| Break000007 | 1.25           |                    
| Break000008 | 2.5            |                    
| Break000009 | 0.02           |

-- Days as unsigned integer                    
SELECT CAST(TRIM(SUBSTRING_INDEX(TRIM(REPLACE(REPLACE(time_lost, 'day', ''), 'hours', '')), ' ',1)) AS UNSIGNED)                    

-- Hours with 2 digit precision                                                       
SELECT CAST(TRIM(SUBSTRING_INDEX(TRIM(REPLACE(REPLACE(time_lost, 'day', ''), 'hours', '')), ' ',-1)) AS DECIMAL (2,2))

然后使用子字符串_INDEX隔离天数（在找到第一个空格之前字符串的左部分）

SELECT TRIM(SUBSTRING_INDEX(TRIM(REPLACE(REPLACE(time_lost, 'day', ''), 'hours', '')), ' ',-1))

| Break000002 | 18.0           |                    
| Break000003 | 10.0           |                    
| Break000004 | 1.52           |                    
| Break000005 | 21.0           |                    
| Break000006 | 0.416666666667 |                    
| Break000007 | 1.25           |                    
| Break000008 | 2.5            |                    
| Break000009 | 0.02           |

-- Days as unsigned integer                    
SELECT CAST(TRIM(SUBSTRING_INDEX(TRIM(REPLACE(REPLACE(time_lost, 'day', ''), 'hours', '')), ' ',1)) AS UNSIGNED)                    

-- Hours with 2 digit precision                                                       
SELECT CAST(TRIM(SUBSTRING_INDEX(TRIM(REPLACE(REPLACE(time_lost, 'day', ''), 'hours', '')), ' ',-1)) AS DECIMAL (2,2))

这给了你这个

| Break000002 | 7|
| Break000003 | 0|                    
| Break000004 | 1|                    
| Break000005 | 2|                    
| Break000006 | 1|                    
| Break000007 | 0|                    
| Break000008 | 0|                    
| Break000009 | 1

SELECT TRIM(SUBSTRING_INDEX(TRIM(REPLACE(REPLACE(time_lost, 'day', ''), 'hours', '')), ' ',-1))

| Break000002 | 18.0           |                    
| Break000003 | 10.0           |                    
| Break000004 | 1.52           |                    
| Break000005 | 21.0           |                    
| Break000006 | 0.416666666667 |                    
| Break000007 | 1.25           |                    
| Break000008 | 2.5            |                    
| Break000009 | 0.02           |

-- Days as unsigned integer                    
SELECT CAST(TRIM(SUBSTRING_INDEX(TRIM(REPLACE(REPLACE(time_lost, 'day', ''), 'hours', '')), ' ',1)) AS UNSIGNED)                    

-- Hours with 2 digit precision                                                       
SELECT CAST(TRIM(SUBSTRING_INDEX(TRIM(REPLACE(REPLACE(time_lost, 'day', ''), 'hours', '')), ' ',-1)) AS DECIMAL (2,2))

使用子字符串_INDEX和负计数（-1），您可以隔离小时数（从末尾找到的第一个空格之前字符串的右部分）

SELECT TRIM(SUBSTRING_INDEX(TRIM(REPLACE(REPLACE(time_lost, 'day', ''), 'hours', '')), ' ',-1))

| Break000002 | 18.0           |                    
| Break000003 | 10.0           |                    
| Break000004 | 1.52           |                    
| Break000005 | 21.0           |                    
| Break000006 | 0.416666666667 |                    
| Break000007 | 1.25           |                    
| Break000008 | 2.5            |                    
| Break000009 | 0.02           |

-- Days as unsigned integer                    
SELECT CAST(TRIM(SUBSTRING_INDEX(TRIM(REPLACE(REPLACE(time_lost, 'day', ''), 'hours', '')), ' ',1)) AS UNSIGNED)                    

-- Hours with 2 digit precision                                                       
SELECT CAST(TRIM(SUBSTRING_INDEX(TRIM(REPLACE(REPLACE(time_lost, 'day', ''), 'hours', '')), ' ',-1)) AS DECIMAL (2,2))

这给了你这个

SELECT TRIM(SUBSTRING_INDEX(TRIM(REPLACE(REPLACE(time_lost, 'day', ''), 'hours', '')), ' ',-1))

| Break000002 | 18.0           |                    
| Break000003 | 10.0           |                    
| Break000004 | 1.52           |                    
| Break000005 | 21.0           |                    
| Break000006 | 0.416666666667 |                    
| Break000007 | 1.25           |                    
| Break000008 | 2.5            |                    
| Break000009 | 0.02           |

-- Days as unsigned integer                    
SELECT CAST(TRIM(SUBSTRING_INDEX(TRIM(REPLACE(REPLACE(time_lost, 'day', ''), 'hours', '')), ' ',1)) AS UNSIGNED)                    

-- Hours with 2 digit precision                                                       
SELECT CAST(TRIM(SUBSTRING_INDEX(TRIM(REPLACE(REPLACE(time_lost, 'day', ''), 'hours', '')), ' ',-1)) AS DECIMAL (2,2))

您还应该将结果转换为数字，因为它们实际上被视为字符串

SELECT TRIM(SUBSTRING_INDEX(TRIM(REPLACE(REPLACE(time_lost, 'day', ''), 'hours', '')), ' ',-1))

| Break000002 | 18.0           |                    
| Break000003 | 10.0           |                    
| Break000004 | 1.52           |                    
| Break000005 | 21.0           |                    
| Break000006 | 0.416666666667 |                    
| Break000007 | 1.25           |                    
| Break000008 | 2.5            |                    
| Break000009 | 0.02           |

-- Days as unsigned integer                    
SELECT CAST(TRIM(SUBSTRING_INDEX(TRIM(REPLACE(REPLACE(time_lost, 'day', ''), 'hours', '')), ' ',1)) AS UNSIGNED)                    

-- Hours with 2 digit precision                                                       
SELECT CAST(TRIM(SUBSTRING_INDEX(TRIM(REPLACE(REPLACE(time_lost, 'day', ''), 'hours', '')), ' ',-1)) AS DECIMAL (2,2))

现在你已经准备好进行计算了

SELECT TRIM(SUBSTRING_INDEX(TRIM(REPLACE(REPLACE(time_lost, 'day', ''), 'hours', '')), ' ',-1))

| Break000002 | 18.0           |                    
| Break000003 | 10.0           |                    
| Break000004 | 1.52           |                    
| Break000005 | 21.0           |                    
| Break000006 | 0.416666666667 |                    
| Break000007 | 1.25           |                    
| Break000008 | 2.5            |                    
| Break000009 | 0.02           |

-- Days as unsigned integer                    
SELECT CAST(TRIM(SUBSTRING_INDEX(TRIM(REPLACE(REPLACE(time_lost, 'day', ''), 'hours', '')), ' ',1)) AS UNSIGNED)                    

-- Hours with 2 digit precision                                                       
SELECT CAST(TRIM(SUBSTRING_INDEX(TRIM(REPLACE(REPLACE(time_lost, 'day', ''), 'hours', '')), ' ',-1)) AS DECIMAL (2,2))

一天，只需求和。在一个小时内，你必须把它们当作一小部分：天=小时/ 24＜/P>

SELECT TRIM(SUBSTRING_INDEX(TRIM(REPLACE(REPLACE(time_lost, 'day', ''), 'hours', '')), ' ',-1))

| Break000002 | 18.0           |                    
| Break000003 | 10.0           |                    
| Break000004 | 1.52           |                    
| Break000005 | 21.0           |                    
| Break000006 | 0.416666666667 |                    
| Break000007 | 1.25           |                    
| Break000008 | 2.5            |                    
| Break000009 | 0.02           |

-- Days as unsigned integer                    
SELECT CAST(TRIM(SUBSTRING_INDEX(TRIM(REPLACE(REPLACE(time_lost, 'day', ''), 'hours', '')), ' ',1)) AS UNSIGNED)                    

-- Hours with 2 digit precision                                                       
SELECT CAST(TRIM(SUBSTRING_INDEX(TRIM(REPLACE(REPLACE(time_lost, 'day', ''), 'hours', '')), ' ',-1)) AS DECIMAL (2,2))

SELECT ( 
         SUM(CAST(TRIM(SUBSTRING_INDEX(TRIM(REPLACE(REPLACE(time_lost, 'day', ''), 'hours', '')), ' ',1)) AS UNSIGNED))                                                             
       + SUM(CAST(TRIM(SUBSTRING_INDEX(TRIM(REPLACE(REPLACE(time_lost, 'day', ''), 'hours', '')), ' ',-1)) AS DECIMAL (2,2)) / 24 )
       ) AS total_days

编辑：有点太晚了

首先为time_lost列使用适当的数据类型。没有内置的解析方法，您需要使用

LOCATE（）自己编写

和

SUBSTR（）

。首先为time\u lost列使用适当的数据类型。没有内置的解析方法，您需要使用

LOCATE（）

和

SUBSTR（）

自己编写。谢谢您的回答。但我不能那样做。我有大量数据，只需要处理给定的字符串类型数据。好的。真可惜。也许一旦你有了一个解决方案，你应该考虑用查询结果替换这个列，以备将来使用。你能再详细一点吗？您希望总和的时间单位是多少？e、天、小时、分钟？天数是否可以超过9天（即10天将是一个额外字符）。小时的准确度是多少（数字不都是相同的长度-前四个是否足够，例如18.0或0.41）？感谢您的关注，这里的天数可以高达2位数，即0-99，我正在尝试以分钟为单位获取总时间，然后以hh:mm格式显示感谢您的回答。但我不能那样做。我有大量数据，只需要处理给定的字符串类型数据。好的。真可惜。也许一旦你有了一个解决方案，你应该考虑用查询结果替换这个列，以备将来使用。你能再详细一点吗？您希望总和的时间单位是多少？e、天、小时、分钟？天数是否可以超过9天（即10天将是一个额外字符）。小时的准确度是多少（数字不都是相同的长度-前四个是否足够，例如18.0或0.41）？感谢您的关注，这里的天数可以高达2位数，即0-99，我正在尝试以分钟为单位获取总时间，然后以hh:mm格式显示

SELECT TRIM(SUBSTRING_INDEX(TRIM(REPLACE(REPLACE(time_lost, 'day', ''), 'hours', '')), ' ',-1))

| Break000002 | 18.0           |                    
| Break000003 | 10.0           |                    
| Break000004 | 1.52           |                    
| Break000005 | 21.0           |                    
| Break000006 | 0.416666666667 |                    
| Break000007 | 1.25           |                    
| Break000008 | 2.5            |                    
| Break000009 | 0.02           |

-- Days as unsigned integer                    
SELECT CAST(TRIM(SUBSTRING_INDEX(TRIM(REPLACE(REPLACE(time_lost, 'day', ''), 'hours', '')), ' ',1)) AS UNSIGNED)                    

-- Hours with 2 digit precision                                                       
SELECT CAST(TRIM(SUBSTRING_INDEX(TRIM(REPLACE(REPLACE(time_lost, 'day', ''), 'hours', '')), ' ',-1)) AS DECIMAL (2,2))