#新增表約束
ALTER TABLE `gd_vedio_comment` ADD CONSTRAINT FOREIGN KEY (vedio_id) REFERENCES `gd_vedio_page_list`(id);

#查詢單個表約束
SELECT
TABLE_NAME,COLUMN_NAME,CONSTRAINT_NAME, REFERENCED_TABLE_NAME,REFERENCED_COLUMN_NAME
FROM INFORMATION_SCHEMA.KEY_COLUMN_USAGE
WHERE
REFERENCED_TABLE_NAME = 'gd_vedio_comment'
 
;

#查詢所有約束
SELECT * FROM INFORMATION_SCHEMA.KEY_COLUMN_USAGE;