Question

我需要知道如何在表中查找主键，如果在任何表中的任何外键中引用了主键。

Answer 1

试试这个：

SELECT  u.COLUMN_NAME as PK, cc.TABLE_NAME, cc.COLUMN_NAME, cc.CONSTRAINT_NAME 
FROM    INFORMATION_SCHEMA.TABLE_CONSTRAINTS c
INNER JOIN INFORMATION_SCHEMA.KEY_COLUMN_USAGE u on c.CONSTRAINT_NAME = u.CONSTRAINT_NAME AND c.CONSTRAINT_TYPE = 'PRIMARY KEY'
INNER JOIN INFORMATION_SCHEMA.REFERENTIAL_CONSTRAINTS r on u.CONSTRAINT_NAME = r.UNIQUE_CONSTRAINT_NAME
INNER JOIN INFORMATION_SCHEMA.CONSTRAINT_COLUMN_USAGE cc on cc.CONSTRAINT_NAME = r.CONSTRAINT_NAME
where c.TABLE_NAME = 'your table'

将为您提供引用表

主键的所有表和列

Answer 2

SELECT *
FROM INFORMATION_SCHEMA.COLUMNS
WHERE TABLE_NAME='tableName'

这将为您提供表格结构。

Answer 3

要从表中获取主键，您可以使用：

select * from INFORMATION_SCHEMA.TABLE_CONSTRAINTS where CONSTRAINT_TYPE = 'PRIMARY KEY' and TABLE_NAME = 'yourTable'

要获得它的参考，你可以使用

select * from INFORMATION_SCHEMA.KEY_COLUMN_USAGE where TABLE_NAME = 'yourTable'

获取主键列是否被称为外键

3 个答案: