请大神改造一下我这个sql语句_电脑网络_问答大全
请大神改造一下我这个sql语句:select ROUND((sum(ORDERAMOUNT)*0.0005),2) as s from boc_payinfo t where 1=1 and mechDate >= '20161001' and mech...
请大神帮我解释一下sql语句_百度知道
请大神帮我解释一下sql语句max->最大值sum(1)->count(*)->求总条数 sum(case when nvl(表2.字段2,0)=0 then 1 else 0 end ) as 别名...