sql - 更新表中的多条记录从另一个 SQL 2008 获取值

Question

我正在尝试更新表列并设置另一个表的值 像这样

UPDATE dbo.TempTable t2
SET    Introd = t1.Introd, AgtCode = t1.[Agt Code], PIN = t1.PIN, IDNo = t1.[ID No] 
FROM   dbo.CustomerData t1
WHERE  t2.PolicyNo = t1.Policy
AND    t2.Prod = t1.Prod
AND    t2.Introd IS DISTINCT FROM t1.Introd

但这对我不起作用，

Answer 1

UPDATE
    Table_1
SET
    Table_1.FieldToBeUpdated = T2.FieldFromWhichToBeUpdated
FROM
    Table_1 T1
INNER JOIN
    Table_2 T2
ON 
    T1.ConditionFieldFromTable1 = T2.ConditionFieldFromTable2

或者

UPDATE
    Table_1 T1,Table_2 T2
SET
    T1.FieldToBeUpdated = T2.FieldFromWhichToBeUpdated
WHERE
    SI.AnyField = RAN.AnyOtherField