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MySQL查询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'
);

当前题目：MySQL查询数据库中没有主键的表
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