sum函数计算次数问题请问以下两种SQL中：select name,sum(price) from tbl order by su_其他解答

sum函数计算次数问题
请问以下两种SQL中：
select name,sum(price) from tbl order by sum(price);对sum(price)计算了两次?
select name,sum(price) t from tbl order by t;对sum(price)计算了一次?
ctrl+L是什么?PLSQL中使用不是查询?

人气：466 ℃　时间：2020-03-24 22:17:00

解答

这两句都仅对sum(price)计算了一次
select name, sum(price) from tbl order by sum(price);
因by sum(price)只是求和前的总和条件