如何在mysql中加入这两个表？

Question

如何连接两个查询以获取表元数据？

select constraint_type 
from information_schema.table_constraints 
where constraint_schema = 'test' 
and table_name='user';


select table_name,column_name,constraint_name,referenced_table_name,referenced_column_name from 
information_schema.key_column_usage   
where table_schema= 'test' 
and  table_name = 'user';

Answer 1

在架构和名称字段上尝试内部联接，如下所示：

SELECT constraint_type, table_constraints.table_name,column_name,constraint_name,referenced_table_name,referenced_column_name
FROM information_schema.table_constraints INNER JOIN information_schema.key_column_usage
ON table_constraints.table_name=information_schema.table_name 
AND table_schema = constraint_schema;