数据查询问题
有表A,表B.查询当表B没有符合表A的存在记录！而我又想保留表B的字段该如何查询？

[解决办法]
select B.* from B where not exists (select 1 from A where A.col = B.col);
[解决办法]

SQL code

或ID主健select * from A where ID not in(select ID from B)go如果相同select * from Aminusselect * from B