select a.table_schema,a.table_name 

from information_schema.tables a left outer join information_schema.table_constraints b  

on a.table_schema = b.table_schema  and a.table_name = b.table_name  and b.constraint_name in ('PRIMARY')  

where b.table_name is null and a.table_schema not in ('information_schema','performance_schema','test','mysql', 'sys')；