让多个变量显示在sql server中？

Question

我有两个问题：

Select count(*) as countOne where field = '1'
Select count(*) as countTwo where field = '2'

在结果查看器中执行这些查询后我想看到的内容：

countOne | countTwo
      23 |      123

如何通过仅运行一个查询来获取两个查询的结果？

Answer 1

SELECT COUNT(CASE WHEN field = '1' THEN 1 END) AS countOne,
       COUNT(CASE WHEN field = '2' THEN 1 END) AS countTwo
FROM   YourTable
WHERE  field IN ( '1', '2' )  

Answer 2

最简单的方法是将每个作为子选项运行，例如。

SELECT 
(
Select count(*) where field = '1' as countOne,
Select count(*) where field = '2' as countTwo
)

BUt这不是最好的方式

另一种方法是按字段分组，然后按PIVOT选择每个组作为单独的列。