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select * from tb where c='' and a in(1,4)
select * from tb where c='' or a in(1,4)
--符合一个条件的
select * from tb where c='' or a in(1,4)
--两个条件都符合的
select * from tb where c='' and a in(1,4)
select * from tb where c='' and a in(1,4)
select * from tb where c='' or a in(1,4)