select sum(if(money > 0, money, 0)) as money from total_money
意思是如果money > 0, 将money的值累加到total_money, 否则将0累加到total_money
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select sum(if(money > 0, money, 0)) as money from total_money
意思是如果money > 0, 将money的值累加到total_money, 否则将0累加到total_money
转载于:https://www.cnblogs.com/ysg520/p/10694194.html