获取缺失主键表信息的MYSQL语句

SELECT a.`TABLE_SCHEMA` AS DB_NAME , a.`TABLE_NAME` , a.`TABLE_ROWS` ,a.`ENGINE` -- , a.* 
FROM 
information_schema.`TABLES` a 
LEFT JOIN information_schema.`TABLE_CONSTRAINTS` b 
ON a.`TABLE_NAME` = b.`TABLE_NAME` AND a.`TABLE_SCHEMA` = b.`TABLE_SCHEMA` 
WHERE b.`TABLE_SCHEMA` IS NULL 
AND a.`TABLE_TYPE` = 'BASE TABLE' 
AND a.`TABLE_SCHEMA` NOT IN ('information_schema','test','mysql','performance_schema') 
ORDER BY DB_NAME ,a.`TABLE_ROWS` DESC ;