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  • mysql关联更新update

    https://blog.csdn.net/babyfish13/article/details/78082844

    *********************************************************************

    样式1:

    update xcs_user_credit_score a1,xcs_user_credit_score a2
       set a1.user_currday_score=a1.user_currday_increment_score+a2.user_currday_score
     where a1.pt_day='2017-09-20' and a2.pt_day='2017-09-19'
       and a1.uid=a2.uid;

    样式2:

        update xcs_user_credit_score a1
         inner join xcs_user_credit_score a2
            on a1.uid=a2.uid
           set a1.user_currday_score=a1.user_currday_increment_score+a2.user_currday_score
         where a1.pt_day='2017-09-20' and a2.pt_day='2017-09-19'
        ;

    突然发现mysql的一些sql语法也很神奇,像这样式的sql语句,在oracle中是行不通的,需要其他的形式。
    另外的几个例子:

        --sub:
        update xcs_user_credit_score a1,xcs_user_credit_score a2
           set a1.user_currday_score=(case when a2.user_currday_score-10>0 then a2.user_currday_score-10 else 0 end)
         where a1.pt_day='2017-09-20' and a2.pt_day='2017-09-19'
           and a1.uid=a2.uid
           and (a1.seqing_score=0 and a1.user_silent_score=0 and a1.jubao_score=0 and a1.chengpaopao_score=0 and a1.weifan_score=0 and a1.upper_manage_score=0 and a1.pay_active_score=0 and a1.view_active_score=0 and a1.message_active_score=0 and a1.gift_active_score=0 and a1.live_active_score=0)
           and a2.user_currday_score>0
        ;
         
        --plus:
        update xcs_user_credit_score a1,xcs_user_credit_score a2
           set a1.user_currday_score=(case when a1.user_currday_score+10<0 then a1.user_currday_score+10 else 0 end)
         where a1.pt_day='2017-09-20' and a2.pt_day='2017-09-19'
           and a1.uid=a2.uid
           and (a1.seqing_score=0 and a1.user_silent_score=0 and a1.jubao_score=0 and a1.chengpaopao_score=0 and a1.weifan_score=0)
           and a1.user_currday_score<0
        ;
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  • 原文地址:https://www.cnblogs.com/zhao1949/p/9406940.html
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