Mysql 将多行合并为一行

我在尝试查询mysql时遇到了一些问题。 我有一些数据如下：

但同时，我想在一个日期内加入所有数据，就像这样：

有人能帮我吗

以下是我的疑问：

SELECT DATE_FORMAT(PRAY_TIME, '%d-%m-%Y') 'SCH_DATE',
IF(PRAY_SCH = 'Subuh', LEFT(RIGHT(DATE_SUB(PRAY_TIME, INTERVAL 17 HOUR), 8), 5), '-') 'SUBUH',
IF(PRAY_SCH = 'Dzuhur', LEFT(RIGHT(DATE_SUB(PRAY_TIME, INTERVAL 5 HOUR), 8), 5), '-') 'DZUHUR',
IF(PRAY_SCH = 'Ashar', LEFT(RIGHT(DATE_ADD(PRAY_TIME, INTERVAL 7 HOUR), 8), 5), '-') 'ASHAR',
IF(PRAY_SCH = 'Maghrib', LEFT(RIGHT(DATE_ADD(PRAY_TIME, INTERVAL 7 HOUR), 8), 5), '-') 'MAGHRIB',
IF(PRAY_SCH = 'Isya', LEFT(RIGHT(DATE_ADD(PRAY_TIME, INTERVAL 7 HOUR), 8), 5), '-') 'ISYA'
FROM T_TABLE_ADZAN_2018 WHERE ID_CITY = '1'
ORDER BY DATE(PRAY_TIME) ASC;

---

您可以使用聚合：

SELECT DATE_FORMAT(PRAY_TIME, '%d-%m-%Y') as SCH_DATE,
       MAX(CASE WHEN PRAY_SCH = 'Subuh', LEFT(RIGHT(DATE_SUB(PRAY_TIME, INTERVAL 17 HOUR), 8), 5) END) as SUBUH,
       MAX(CASE WHEN PRAY_SCH = 'Dzuhur', LEFT(RIGHT(DATE_SUB(PRAY_TIME, INTERVAL 5 HOUR), 8), 5) END) as DZUHUR,
       MAX(CASE WHEN PRAY_SCH = 'Ashar', LEFT(RIGHT(DATE_ADD(PRAY_TIME, INTERVAL 7 HOUR), 8), 5) END) as ASHAR,
       MAX(CASE WHEN PRAY_SCH = 'Maghrib', LEFT(RIGHT(DATE_ADD(PRAY_TIME, INTERVAL 7 HOUR), 8), 5) END) as MAGHRIB,
       MAX(CASE WHEN PRAY_SCH = 'Isya', LEFT(RIGHT(DATE_ADD(PRAY_TIME, INTERVAL 7 HOUR), 8), 5) END) as ISYA
FROM T_TABLE_ADZAN_2018
WHERE ID_CITY = 1
GROUP BY DATE_FORMAT(PRAY_TIME, '%d-%m-%Y') ASC;

注:

• 分组依据

  键应该是您选择的键
• 不要对列别名使用单引号。仅对字符串和日期常量使用单引号
• 使用

  MAX（）

• 大概，

  ID\u CITY

  是一个数字，所以将其与数字进行比较，而不是字符串

• CASE

  表达式是

  ANSI

  标准

  IF（）

  是特定于MySQL的

---

您可以使用聚合：

SELECT DATE_FORMAT(PRAY_TIME, '%d-%m-%Y') as SCH_DATE,
       MAX(CASE WHEN PRAY_SCH = 'Subuh', LEFT(RIGHT(DATE_SUB(PRAY_TIME, INTERVAL 17 HOUR), 8), 5) END) as SUBUH,
       MAX(CASE WHEN PRAY_SCH = 'Dzuhur', LEFT(RIGHT(DATE_SUB(PRAY_TIME, INTERVAL 5 HOUR), 8), 5) END) as DZUHUR,
       MAX(CASE WHEN PRAY_SCH = 'Ashar', LEFT(RIGHT(DATE_ADD(PRAY_TIME, INTERVAL 7 HOUR), 8), 5) END) as ASHAR,
       MAX(CASE WHEN PRAY_SCH = 'Maghrib', LEFT(RIGHT(DATE_ADD(PRAY_TIME, INTERVAL 7 HOUR), 8), 5) END) as MAGHRIB,
       MAX(CASE WHEN PRAY_SCH = 'Isya', LEFT(RIGHT(DATE_ADD(PRAY_TIME, INTERVAL 7 HOUR), 8), 5) END) as ISYA
FROM T_TABLE_ADZAN_2018
WHERE ID_CITY = 1
GROUP BY DATE_FORMAT(PRAY_TIME, '%d-%m-%Y') ASC;

注:

• 分组依据

  键应该是您选择的键
• 不要对列别名使用单引号。仅对字符串和日期常量使用单引号
• 使用

  MAX（）

• 大概，

  ID\u CITY

  是一个数字，所以将其与数字进行比较，而不是字符串

• CASE

  表达式是

  ANSI

  标准

  IF（）

  是特定于MySQL的

您可以这样尝试：

select
    DATE_FORMAT(a.PRAY_TIME, '%d-%m-%Y') 'SCH_DATE',
    LEFT(RIGHT(DATE_SUB(b.PRAY_TIME, INTERVAL 17 HOUR), 8), 5) as SUBUH,
    LEFT(RIGHT(DATE_SUB(c.PRAY_TIME, INTERVAL 5 HOUR), 8), 5) as DZUHUR,
    LEFT(RIGHT(DATE_ADD(PRAY_TIME, INTERVAL 7 HOUR), 8), 5) as MAGHRIB,
    LEFT(RIGHT(DATE_ADD(PRAY_TIME, INTERVAL 7 HOUR), 8), 5) as ISYA
    from T_TABLE_ADZAN_2018 as a 
    left join T_TABLE_ADZAN_2018 as b on DATE_FORMAT(a.PRAY_TIME,'%d-%m-%Y')=DATE_FORMAT(a.PRAY_TIME,'%d-%m-%Y') and b.PRAY_SCH='Dzuhur'
    left join T_TABLE_ADZAN_2018 as c on DATE_FORMAT(a.PRAY_TIME,'%d-%m-%Y')=DATE_FORMAT(c.PRAY_TIME,'%d-%m-%Y') and b.PRAY_SCH='Ashar'
    left join T_TABLE_ADZAN_2018 as d on DATE_FORMAT(a.PRAY_TIME,'%d-%m-%Y')=DATE_FORMAT(d.PRAY_TIME,'%d-%m-%Y') and b.PRAY_SCH='Maghrib'
    left join T_TABLE_ADZAN_2018 as e on DATE_FORMAT(a.PRAY_TIME,'%d-%m-%Y')=DATE_FORMAT(e.PRAY_TIME,'%d-%m-%Y') and b.PRAY_SCH='Maghrib' WHERE a.ID_CITY = '1'

您可以这样尝试：

select
    DATE_FORMAT(a.PRAY_TIME, '%d-%m-%Y') 'SCH_DATE',
    LEFT(RIGHT(DATE_SUB(b.PRAY_TIME, INTERVAL 17 HOUR), 8), 5) as SUBUH,
    LEFT(RIGHT(DATE_SUB(c.PRAY_TIME, INTERVAL 5 HOUR), 8), 5) as DZUHUR,
    LEFT(RIGHT(DATE_ADD(PRAY_TIME, INTERVAL 7 HOUR), 8), 5) as MAGHRIB,
    LEFT(RIGHT(DATE_ADD(PRAY_TIME, INTERVAL 7 HOUR), 8), 5) as ISYA
    from T_TABLE_ADZAN_2018 as a 
    left join T_TABLE_ADZAN_2018 as b on DATE_FORMAT(a.PRAY_TIME,'%d-%m-%Y')=DATE_FORMAT(a.PRAY_TIME,'%d-%m-%Y') and b.PRAY_SCH='Dzuhur'
    left join T_TABLE_ADZAN_2018 as c on DATE_FORMAT(a.PRAY_TIME,'%d-%m-%Y')=DATE_FORMAT(c.PRAY_TIME,'%d-%m-%Y') and b.PRAY_SCH='Ashar'
    left join T_TABLE_ADZAN_2018 as d on DATE_FORMAT(a.PRAY_TIME,'%d-%m-%Y')=DATE_FORMAT(d.PRAY_TIME,'%d-%m-%Y') and b.PRAY_SCH='Maghrib'
    left join T_TABLE_ADZAN_2018 as e on DATE_FORMAT(a.PRAY_TIME,'%d-%m-%Y')=DATE_FORMAT(e.PRAY_TIME,'%d-%m-%Y') and b.PRAY_SCH='Maghrib' WHERE a.ID_CITY = '1'

---

你确定你想要的输出是正确的吗？这个问题源于糟糕的设计。数据库表不是电子表格。不要将输入/输出数据作为图像发布。使用文本！从文本生成测试数据要容易得多。从输入到输出的规则是什么？你的问题不完整。@CraigYoung对不起，伙计……你确定吗，你想要的输出是正确的？这个问题源于糟糕的设计。数据库表不是电子表格。不要将输入/输出数据作为图像发布。使用文本！从文本生成测试数据要容易得多。从输入到输出的规则是什么？你的问题不完整。@CraigYoung抱歉伙计。。。