mysql 查找所有数据库中没有主键的表

版权声明：本文为博主原创文章，未经博主允许不得转载。 https://blog.csdn.net/ailo555/article/details/82706756

mysql 查找所有数据库中没有主键的表：

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' --排除系统库
);