查找列中不同值的计数

Question

大家好我正在尝试构建一个SQL查询来在仪表板上显示一些信息。

我有一张表存储我的销售数据。我的查询需要查找过去7天的总销售额，平均值并根据区域（存在于用户表中）对其进行分组。我创建了一个临时表获取项目sales.DashBoard_Items表包含需要在仪表板上显示的特定项目。现在我的问题是我需要获取每个地区的商店数量来查找平均销售额。可以请一些人帮忙

Declare @TableTest 
table(itemid int,itemname varchar(100),itemdescription varchar(100),id int,itemidd int,userid int,orderdate varchar(40),qty int)

insert into @TableTest 
select * from DashBoard_Items join
 SalesQTY on SalesQTY.OrderDate>=  CONVERT(varchar(10) , DATEADD(DAY,-7,GETDATE()),126) 
 and OOS_DashBoard_CoreItems.itemid=SalesQTY.itemid


select distinct t.userid,u.region from @TableTest t join users u on t.userid=u.userid and region is not null

以上选择查询返回

如何从上面的选择查询中获取区域数

    region             count
 5 - SUN WEST            2
 2 - LONG ISLAND         3

Answer 1

您需要按region分组，然后使用cont(*)

SELECT region, count(*) 
FROM @TableTest
GROUP BY region;

Answer 2

请尝试：

SELECT 
    Region, 
    COUNT(*) AS [Count]
FROM YourTable 
GROUP BY Region

OR

SELECT 
    DISTINCT Region, 
    COUNT(*) OVER (PARTITION BY Region)  AS [Count]
FROM YourTable

Answer 3

SELECT u.region, COUNT(*)
FROM @TableTest t JOIN users u ON t.userid=u.userid AND u.region IS NOT NULL
GROUP BY u.region

Answer 4

尝试

SELECT region, count( * )
FROM mytable
GROUP BY region