Question

在SQL-server数据库中我想用table2的值更新table1，我有两个表pay_tbl和bill_tbl。这两个属性具有以下属性。

pay_tbl
    pay_ID type int -->pk
    outstanding_amount type int

bill_tbl
    pay_ID type int --> Fk
    amount_to_Pay type int
    amount_paid type int
    paid_date type date
    bill_status type varchar

我想通过添加table2的amount_to_pay列的值来更新pay_tbl的outstanding_amount列

(outstanding_payment+=amount_to_pay)

但只是更新帐单状态为“未付款”的帐户。和日期是相对于当月的上个月，即：现在月份是2月，然后只更新日期为1月的表格。我尝试了以下查询，但我知道这是错误的

UPDATE pay_tbl 
SET 
    outstanding_payment = outstanding_Payment + 
                          (SELECT 
                               amount_to_pay 
                           FROM bill_tbl INNER JOIN bill_tbl ON
                                bill_tbl.pay_ID = pay_tbl.payID )
WHERE
    MONTH(Date) = DATEPART(MONTH, DATEADD(MONTH, -1, [Date]))
    AND YEAR(Date) = DATEPART(YEAR, DATEADD(MONTH, -1, [Date]))

Answer 1

        UPDATE
    TABLE_A
SET
    TABLE_A.OUTSTANDING_PAYMENT = TABLE_A.OUTSTANDING_PAYMENT+TABLE_B.AMOUNT_TO_PAY

FROM
    PAY_TBL AS TABLE_A
    INNER JOIN (SELECT SUM(AMOUNT_TO_PAY) AMOUNT_TO_PAY ,PAY_ID FROM BILL_TBL WHERE  MONTH(DATE) =  DATEPART(MONTH, DATEADD(MONTH, -1, [DATE]))
AND YEAR(DATE) =    DATEPART(YEAR, DATEADD(MONTH, -1, [DATE]))
AND BILL_STATUS='NO PAID'
GROUP BY PAY_ID) AS TABLE_B
        ON TABLE_A.PAY_ID = TABLE_B.PAY_ID

通过计算上个月其他表中的值来更新表

1 个答案: