公式有问题
利润率怎么能参与自身的计算,这不死循环了

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UPDATE T1 SET T1.值=(CASE WHEN ISNULL(T2.B,0)=0 THEN 1 ELSE ISNULL(T2.A,0)/T2.B END) FROM TABLENAME T1 INNER JOIN (
SELECT A.ID,A.值 [A],B.值 [B] FROM (
SELECT id,值 FROM TABLENAME WHERE 名称='接单利润额'
) A LEFT JOIN (
SELECT id,值 FROM TABLENAME WHERE 名称='接单额'
) B ON A.ID=B.ID
) T2 ON T1.ID=T2.ID WHERE T1.名称='接单利润率'