Mysql 数据库中所有表中的字段总数

我有一个包含数百个表的大型数据库，我想找出所有表中定义的字段（列）总数

有一个sql查询可以给我这个结果吗？如果没有，最好的办法是什么？

这就是你想要的吗

select count(*)
from information_schema.columns
where table_schema = 'your_schema'

您可以这样运行它，看看它是否合理：

select table_name, column_name
from information_schema.columns
where table_schema = 'your_schema'
order by 1, 2

尝试以下操作（登录到当前架构时）：

试试这个：

SELECT COUNT(*) 
FROM INFORMATION_SCHEMA.COLUMNS

---

您可以从这个名为的开源项目中获得所需的查询。这个项目的最终结果超出了你的需要，但是您可以查看代码并找出其中的部分来计算表的所有部分。

我在mysql中是新手，但是如果表信息\u模式。列是包含表名和列名信息的表，那么您可以使用以下查询

select table_name, count( distinct column_name ) column_number_used
from information_schema.columns 
where table_schema = 'your_schema' 
group by table_name

---

这应该给出所有表名以及该表中使用的相应列号。

下面的示例可以根据您的要求工作和修改查询

Use [Your_DB_Name]

/* Count Total Number Of Tables */
SELECT COUNT(*) AS 'Total Tables' FROM INFORMATION_SCHEMA.TABLES WHERE TABLE_TYPE='BASE TABLE'

/* Count Total Number Of Views */
SELECT COUNT(*)  AS 'Total Views'  FROM INFORMATION_SCHEMA.VIEWS

/* Count Total Number Of Stored Procedures */
SELECT COUNT(*)  AS 'Total SPs'  FROM INFORMATION_SCHEMA.ROUTINES WHERE ROUTINE_TYPE = 'PROCEDURE'

/* Count Total Number Of UDF(User Defined Functions) */
SELECT COUNT(*)  AS 'Total Functions' FROM INFORMATION_SCHEMA.ROUTINES WHERE ROUTINE_TYPE = 'FUNCTION'

示例：

Use [Your_DB_Name]

/* Count Total Number Of Tables */
SELECT COUNT(*) AS 'Total Tables' FROM INFORMATION_SCHEMA.TABLES WHERE TABLE_TYPE='BASE TABLE'

/* Count Total Number Of Views */
SELECT COUNT(*)  AS 'Total Views'  FROM INFORMATION_SCHEMA.VIEWS

/* Count Total Number Of Stored Procedures */
SELECT COUNT(*)  AS 'Total SPs'  FROM INFORMATION_SCHEMA.ROUTINES WHERE ROUTINE_TYPE = 'PROCEDURE'

/* Count Total Number Of UDF(User Defined Functions) */
SELECT COUNT(*)  AS 'Total Functions' FROM INFORMATION_SCHEMA.ROUTINES WHERE ROUTINE_TYPE = 'FUNCTION'