错误(1093):您无法在FROM子句中更新目标表以进行更新 [英] Error (1093):You cant update target table for update in FROM Clause

问题描述

这是我已获得正确答案的选择语句:

select s_billing_cycle.Billing_cycle from s_billing_cycle 
join o_daily_lcsgeneration_copy on o_daily_lcsgeneration_copy.Location=s_billing_cycle.Location where o_daily_lcsgeneration_copy.Date between s_billing_cycle.From_Date and s_billing_cycle.To_Date

在将同一查询更新到另一个表时，我无法使用update query get来做到这一点: 您无法在FROM子句中更新目标表"o_daily_lcsgeneration_copy"以进行更新 我使用的查询是:

while updating the same query into another table i couldnt do that using update query getting : You cant update target table "o_daily_lcsgeneration_copy" for update in FROM Clause the query i have used is :

update o_daily_lcsgeneration_copy  set o_daily_lcsgeneration_copy.Billing_cycle = (select s_billing_cycle.Billing_cycle from s_billing_cycle join o_daily_lcsgeneration_copy on o_daily_lcsgeneration_copy.Location=s_billing_cycle.Location where o_daily_lcsgeneration_copy.Date between s_billing_cycle.From_Date and s_billing_cycle.To_Date) 

救救我！

推荐答案

将其包装在子查询中(因此创建临时表)

wrap it in a subquery (thus creating temporary table)

UPDATE  o_daily_lcsgeneration_copy
SET     o_daily_lcsgeneration_copy.Billing_cycle = 
(
    SELECT Billing_cycle
    FROM
    (
        SELECT  s_billing_cycle.Billing_cycle
        FROM    s_billing_cycle
                INNER JOIN o_daily_lcsgeneration_copy
                    ON o_daily_lcsgeneration_copy.Location = s_billing_cycle.Location
        WHERE   o_daily_lcsgeneration_copy.DATE BETWEEN s_billing_cycle.From_Date
                AND s_billing_cycle.To_Date
    ) s
)

或JOIN表

UPDATE  o_daily_lcsgeneration_copy a
        INNER JOIN s_billing_cycle b
            ON a.Location = b.Location
SET     a.Billing_cycle = b.Billing_cycle
WHERE   a.DATE BETWEEN b.From_Date AND b.To_Date

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