版权声明:本文为博主原创文章,未经博主允许不得转载。 https://blog.csdn.net/BabyFish13/article/details/78082844
样式1:
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update xcs_user_credit_score a1,xcs_user_credit_score a2
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set a1.user_currday_score=a1.user_currday_increment_score+a2.user_currday_score
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where a1.pt_day='2017-09-20' and a2.pt_day='2017-09-19'
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and a1.uid=a2.uid;
样式2:
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update xcs_user_credit_score a1
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inner join xcs_user_credit_score a2
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on a1.uid=a2.uid
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set a1.user_currday_score=a1.user_currday_increment_score+a2.user_currday_score
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where a1.pt_day='2017-09-20' and a2.pt_day='2017-09-19'
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;
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:
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--sub:
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update xcs_user_credit_score a1,xcs_user_credit_score a2
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set a1.user_currday_score=(case when a2.user_currday_score-10>0 then a2.user_currday_score-10 else 0 end)
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where a1.pt_day='2017-09-20' and a2.pt_day='2017-09-19'
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and a1.uid=a2.uid
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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)
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and a2.user_currday_score>0
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;
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--plus:
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update xcs_user_credit_score a1,xcs_user_credit_score a2
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set a1.user_currday_score=(case when a1.user_currday_score+10<0 then a1.user_currday_score+10 else 0 end)
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where a1.pt_day='2017-09-20' and a2.pt_day='2017-09-19'
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and a1.uid=a2.uid
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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)
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and a1.user_currday_score<0
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;
来源:https://blog.csdn.net/babyfish13/article/details/78082844