查询MySQL数据库中没有主键的表

以下语句可批量查询MySQL数据库中未设置主键的表，查询后会列出所有未设置主键的表。

select table_schema,table_name from information_schema.tables 
where (table_schema,table_name) not in(
    select distinct table_schema,table_name from information_schema.columns where COLUMN_KEY='PRI'    
)
and table_schema not in (
    'sys','mysql','information_schema','performance_schema'
);

效果如图：