culuo4781的博客sql中分类avg函数 In this article, we will learn the SQL Average function which is known as AVG() function in T-SQL. AVG() function is an aggregate function that calculates the average value of a ....
陶斯琴的博客问题:计算平均数,但希望排除最大和最小值,以(希望能)减少数据畸...解决方案MySQL和PostgreSQL使用子查询排除最高和最低值:1 select avg(sal)2 from emp3 where sal not in (4 (select min(sal) from emp),5 (se...