Mysql显示创建约束？

Question

有没有一种简单的方法来查询表的约束（foreignkeys specificaly） 像show create table一样，但仅限于约束？

感谢，

pvgoddijn

Answer 1

，只显示外键约束，你可以通过加入

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; 

Answer 2

SHOW TABLE STATUS FROM db_name LIKE 'tbl_name'; 

外键约束在输出的注释列中列出。

Answer 3

MySQL 5.1 Manual

SHOW TABLE STATUS FROM db_name LIKE 'tbl_name'; 

Answer 4

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