oracle 两张关联表执行更新update

UPDATE T_ASN_DTL ad1 SET ad1.cf03=(
    SELECT ac.TH003 FROM "T_ASN_DTL_copy" ac
 WHERE ac.udf06=ad1.INSPECTER_NAME and ac.udf05=ad1.LINE_ITEM_NO
) WHERE EXISTS (SELECT 1 FROM "T_ASN_DTL_copy"  ac WHERE ac.udf06=ad1.INSPECTER_NAME and ac.udf05=ad1.LINE_ITEM_NO)

UPDATE 表2
  SET 表2.C =
     (SELECT B
       FROM 表1
      WHERE 表1.A = 表2.A)
 WHERE EXISTS
     (SELECT 1
       FROM 表1
      WHERE 表1.A = 表2.A);