SQL AdventureWorks 按城市按性别统计员工数量

Question

我想按性别统计城市，像这样；

City    GenderFCount  GenderMCount
Redmond 10             20   

这是我的查询在 AdventureWorks 数据库中获取城市和性别

select Gender,City from HumanResources.Employee as t1
    inner join HumanResources.EmployeeAddress as t2
    on t1.EmployeeID = t2.EmployeeID
    inner join Person.Address as t3
    on t2.AddressID = t3.AddressID

如果可能的话，您可以通过多种方式展示解决方案，例如“PIVOT”，通过sql函数（UDF），存储过程或其他方式。

谢谢

Answer 1

这是 PIVOT 查询，您可以将其转储到存储过程或 udf

select City, F as GenderFCount, M as GenderMCount
 from(
select Gender,City
from HumanResources.Employee as t1
    inner join HumanResources.EmployeeAddress as t2
    on t1.EmployeeID = t2.EmployeeID
    inner join Person.Address as t3
    on t2.AddressID = t3.AddressID
    ) AS pivTemp
PIVOT
(   count(Gender)
    FOR Gender IN ([F],[M])
) AS pivTable

UDF 示例

CREATE FUNCTION fnPivot()
RETURNS TABLE

AS
RETURN (
select City, F as GenderFCount, M as GenderMCount
 from(
select Gender,City
from HumanResources.Employee as t1
    inner join HumanResources.EmployeeAddress as t2
    on t1.EmployeeID = t2.EmployeeID
    inner join Person.Address as t3
    on t2.AddressID = t3.AddressID
    ) AS pivTemp
PIVOT
(   count(Gender)
    FOR Gender IN ([F],[M])
) AS pivTable
)
GO

中，现在您可以这样调用它

 SELECT * FROM dbo.fnPivot()

Answer 2

这里它使用嵌入在过程中的 CTE。现在，我正在使用 AdventureWorks 2012，因为这就是我所拥有的全部。但概念是一样的。

    USE [AdventureWorks]
    GO
    /****** Object:  StoredProcedure [dbo].[GenderCountbyCity]    Script Date: 4/20/2016 9:07:04 AM ******/
    SET ANSI_NULLS ON
    GO
    SET QUOTED_IDENTIFIER ON
    GO
    ALTER PROCEDURE [dbo].[GenderCountbyCity]

    AS

    BEGIN

    ;WITH EmpF
            AS (
                    SELECT pa.City, hre.Gender, COUNT(hre.Gender) AS CountF
                            FROM Person.BusinessEntityAddress pbea
                                    JOIN Person.Address pa
                                            ON pbea.AddressID = pa.AddressID
                                    JOIN HumanResources.Employee hre
                                            ON pbea.BusinessEntityID = hre.BusinessEntityID
                            WHERE hre.Gender = 'F'
                            GROUP BY pa.City, hre.Gender
                    ),

    EmpM
            AS (
                    SELECT pa.City, hre.Gender, COUNT(hre.Gender) AS CountM
                            FROM Person.BusinessEntityAddress pbea
                                    JOIN Person.Address pa
                                            ON pbea.AddressID = pa.AddressID
                                    JOIN HumanResources.Employee hre
                                            ON pbea.BusinessEntityID = hre.BusinessEntityID
                            WHERE hre.Gender = 'M'
                            GROUP BY pa.City, hre.Gender
                    )

    SELECT COALESCE(EmpF.City,EmpM.City) AS City, COALESCE(EmpF.CountF,0) AS GenderFCount, COALESCE(EmpM.CountM,0) AS GenderMCount
            FROM EmpF
                    FULL JOIN EmpM
                            ON EmpF.City = EmpM.City
            ORDER BY COALESCE(EmpF.City,EmpM.City)

    END

如果您想创建而不是更改过程，只需将“ALTER”更改为“CREATE”即可。然后刷新存储过程列表，您可以从那里修改它。之后，“CREATE”将自动显示“ALTER”，如果成功，则按 F5 时将保存所有更改。然后您可以键入 EXEC dbo.GenderCountbyCity （或任何您的名字）[或者只需右键单击该过程并选择“执行存储过程”]，您将获得结果。