mysql關聯更新update

樣式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
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