检查列是否为键 [英] Check if a column is a key

问题描述

SQL中是否可以检查列是主键还是外键?

Is there a way in SQL to check whether a column is a Primary or Foreign key?

推荐答案

尝试一下.

SELECT constraint_type
FROM INFORMATION_SCHEMA.TABLE_CONSTRAINTS a, INFORMATION_SCHEMA.CONSTRAINT_COLUMN_USAGE b
WHERE a.table_name=''table_name''
AND a.constraint_name=b.constraint_name
AND b.column_name =''column_name'';

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