[英]SQL Server query from 2 tables with grouping and average calc
I've got 2 tables in SQL Server database: 我在SQL Server数据库中有2个表:
What I need is query that returns table with grouped records by [opt_1] and [opt_2] like this: 我需要的是返回按[opt_1]和[opt_2]分组记录的表的查询,如下所示:
[opt_1],
[opt_2],
{count of such records from table_1},
{count of such records from table_2, by [id]},
{average [result] from table_2, by [id]}
What is the best way to get it? 最好的方法是什么?
You could use join
and group by
; 您可以使用
join
和group by
;
select t1.opt_1,t2.opt_2,count(t1.id),AVG(t2.result) from table1 t1
inner join table2 t2 ON t1.id = t2.id
group by t1.opt_1,t2.opt_2
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