查看mysql实例中哪些表没有主键/哪些表有主键

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查看实例中哪些表没有主键

select t1.table_schema,t1.table_name from information_schema.tables t1 
left outer join
information_schema.TABLE_CONSTRAINTS t2   
on t1.table_schema = t2.TABLE_SCHEMA  and t1.table_name = t2.TABLE_NAME  and t2.CONSTRAINT_NAME in
('PRIMARY') 
where t2.table_name is null and t1.TABLE_SCHEMA not in ('information_schema','performance_schema','test','mysql', 'sys')；

查看实例中哪些表有主键

select t1.table_schema,t1.table_name from information_schema.tables t1 
left outer join
information_schema.TABLE_CONSTRAINTS t2   
on t1.table_schema = t2.TABLE_SCHEMA  and t1.table_name = t2.TABLE_NAME  and t2.CONSTRAINT_NAME in
('PRIMARY') 
where t2.table_name is not null and t1.TABLE_SCHEMA not in ('information_schema','performance_schema','test','mysql', 'sys')；