b sql statement how to determine whether the column A of the table in a column data present in Table B

Others 2019-08-16 16:32:01 views: null

--存在
select *
from A
where exists(select 1 from B where A.a = B.b)
--不存在
select *
from A
where not exists(select 1 from B where A.a = B.b)

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