Question

是否可以为count >=3,4,5,6,7,8等执行以下操作而不是为每个计数类别重复整个代码

Insert into OnePlus (SELECT DISTINCT Id, Name, COUNT(DISTINCT StartDate) AS OnePlusDays
    FROM DataTable
    HAVING OnePlusDays >= 1
    GROUP BY Id, Name)

Insert into TwoPlus (SELECT DISTINCT Id, Name, COUNT(DISTINCT StartDate) AS TwoPlusDays
    FROM DataTable
    HAVING TwoPlusDays >= 2
    GROUP BY Id, Name)

最后

SELECT Id, Name, "1+" AS Categories
    FROM OnePlus
UNION
    SELECT Id, Name, "2+" AS Categories
    FROM TwoPlus

Answer 1

你只在标签中提到sql。根据MySql或SQL Server，您可能需要更改转换/转换和连接。但这个查询可能有所帮助。你真的不需要将一个区别放在一个组中，你正在分组，这意味着只有不同的值，它们的计数才会被提取。

当然，表OnePlus，实际上就是你所谓的类别。

Insert into OnePlus 
   SELECT Id, Name, convert(varchar(10), COUNT(DISTINCT StartDate) ) + "+" AS Categories
    FROM DataTable
    GROUP BY Id, Name

Answer 2

在T-SQL中，您可以写为：

SELECT Id, 
       NAME , -- make sure you write case statement in desc order
       CASE WHEN PlusDays > = 2 THEN '2+' 
            WHEN PlusDays > = 1 THEN '1+' END AS Categories
FROM 
(
SELECT DISTINCT Id, Name, COUNT(DISTINCT StartDate) PlusDays
FROM @DataTable
GROUP BY Id, Name
) AS T 
ORDER BY Id asc

用于计算行和分类的SQL

2 个答案: