mysql是否显示create约束?

要仅显示外键约束,可以检查information\u schema.table\u约束中的约束类型,并通过join获取information\u schema.key\u column\u用法中受影响的列。

SELECT b.table_name, b.column_name, b.constraint_name,
       b.referenced_table_name, b.referenced_column_name
FROM information_schema.table_constraints a
JOIN information_schema.key_column_usage b
ON a.table_schema = b.table_schema AND a.constraint_name = b.constraint_name
WHERE a.table_schema=database() AND a.constraint_type='FOREIGN KEY'
ORDER BY b.table_name, b.constraint_name;

select * from 
information_schema.KEY_COLUMN_USAGE 
where table_schema = <db_name> 
and table_name = <table_name>;

SHOW TABLE STATUS FROM db_name LIKE 'tbl_name';

外键约束列在输出的注释列中。

MySQL 5.1 Manual

SHOW TABLE STATUS FROM db_name LIKE 'tbl_name';