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--肯定式逻辑
SELECT A.* FROM A INNER JOIN B ON A.SomethingID = B.ID
SELECT * FROM A WHERE SomethingID IN (SELECT ID FROM B)
SELECT * FROM A WHERE EXISTS (SELECT * FROM B WHERE B.ID = A.SomethingID)
--否定式逻辑
SELECT A.* FROM A LEFT JOIN B ON A.SomethingID = B.ID WHERE B.ID IS NULL
SELECT * FROM A WHERE SomethingID NOT IN (SELECT ID FROM B)
SELECT * FROM A WHERE NOT EXISTS (SELECT * FROM B WHERE B.ID = A.SomethingID)
update tba
set time=getdate()
from tba,tbb
where tba.id=tbb.id