Talk about not in and exists

Source: Internet
Author: User

Select Count(1)      fromEemployeewhereStatus=1      andEid not inch(SelectEid fromCbenefit_status) Even a record? is becauseSelectEid fromCbenefit_status The Eid is empty solution:1/Change to select Eid fromCbenefit_statuswhereEid is  not NULL    --where Eid is not null    Select Count(1)          fromEemployeewhereStatus=1          andEid not inch(SelectEid fromCbenefit_statuswhereEid is  not NULL)    2/ Select *  fromTable1 Awhere  not exists(SELECT *  fromTable2 BwhereB.col1=a.col1)Select Count(1)          fromEemployee awhereStatus=1         and  not exists(Select 1  fromCbenefit_status bwhereA.eid=b.eid) Reference URL:

Talk about not in and exists

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