Question

我希望得到分行中女性的比率基本上看起来像这样：

BranchID   | CountOfWomen   | CountofMen      | CountOfWomen/CountOfMen
(B001),           (3),            (4),                  (0.75)
(B002),           (1),            (1),                   (1)

所以现在我有一个分行的女性比率： B001雇主中有75％是女性...... 我现在需要的是：

费率（CountOfWomen / CountOfMen）分为3类：Avarage，Low，High

Avarage意味着IF CountOfWomen / CountofMen为1，因此1：1的比率

低意味着IF CountOfWomen / CountofMen <1

高意味着如果CountOfWomen / CountofMen> 1 ...... ......工作的男性比女性更多......

我试过以下：

我正在尝试创建一个视图并将值放在已定位的列中，但它不起作用!!

   CREATE VIEW MFKata2 (BranchID,High,Low,Avarage ) AS
    SELECT       MFKata.BranchID,
    Case When(MFKata.Quote > 1) As High,
    Case When (MFKata.Quote < 1) As Low,
    Case When (MFKata.Quote = 1) As Avarage
    FROM         MFKata

引用是率（CountOfWomen / CountOfMen）我刚刚在这里重命名它以便更好地解释！

这是创建MFKata的代码：

CREATE VIEW MFKata (BranchID,AnzahlF, AnzahlM,Quote ) 
AS
SELECT    Frauen2.BranchID
        , AnzahlF
        , AnzahlM
        , CAST(AnzahlF as float)/CAST(AnzahlM as float) as Quote
FROM  Frauen2  
INNER JOIN Maenner ON Frauen2.BranchID = Maenner.BranchID

Answer 1

您的所有案例陈述都缺少END。

 CREATE VIEW MFKata2 (BranchID,High,Low,Avarage ) AS
    SELECT       MFKata.BranchID,
    Case When (MFKata.Quote > 1) THEN 1 END AS High,
    Case When (MFKata.Quote < 1) THEN 1 END As Low,
    Case When (MFKata.Quote = 1) THEN 1 END As Avarage
    FROM

或者你可以有一个列为高/低/平均值，像......一样......

 CREATE VIEW MFKata2 (BranchID,[Rate]) AS
    SELECT       MFKata.BranchID,
    Case When (MFKata.Quote > 1) THEN 'High'
         When (MFKata.Quote < 1) THEN 'Low'
         When (MFKata.Quote = 1) THEN 'Avarage' 
      END AS [Rate]
    FROM

修改

除非绝对必要，否则避免在视图之上创建视图，这可以通过非常简单的选择查询来实现。有点像......

SELECT BranchID , Case When (Quote > 1) THEN 'High' When (Quote < 1) THEN 'Low' When (Quote = 1) THEN 'Average' END AS [Rate] FROM ( SELECT Frauen2.BranchID , AnzahlF , AnzahlM , CAST(AnzahlF as float)/CAST(AnzahlM as float) as Quote FROM Frauen2 INNER JOIN Maenner ON Frauen2.BranchID = Maenner.BranchID ) A

如何基于SQL列值进行分类

1 个答案: