select A.x + A.y AS z FROM A WHERE z = 10 -- z 在此处不可用,因为SELECT是最后执行的语句!
SELECT A.x + A.y AS z FROM AWHERE (A.x + A.y) = 10
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THE END
select A.x + A.y AS z FROM A WHERE z = 10 -- z 在此处不可用,因为SELECT是最后执行的语句!
SELECT A.x + A.y AS z FROM AWHERE (A.x + A.y) = 10