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开发写了几个语句,觉得查询结果跟逻辑有点不相符,就拿到这里一起分析了下。 语句如下: select tp.title, tp.amount, ifnull(sum(case when tu.type = 1 then ti.invest_a...
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以下两条语句是否可以合并成一条: update t9 set id=1 where b>'2015-10-12'; update t9 set id=1, e='2015-01-01' where b='2015-10-12'; 既然...
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需要:根据身份证信息来获取用户属性 方法:可以使用如下sql语句: select case left(id_number,2) when '11' then '北京市' when '12' then '天津市' when '13' then...