Question

我希望将列转换为字符串，其中列是选择语句，然后与另一列连接。这是我在使用CONVERT或CAST时发生混淆的地方。

示例：

 SELECT employeeID
    ,name
    ,location
    ,(SELECT COUNT(DISTINCT loginsFailed)
     FROM users
     WHERE (users.employeedID = userDetails.employeeID)
        AND (users.startdate = 01-01-2013) as LoginCountFailed
  ,(SELECT COUNT(DISTINCT logins)
   FROM users
   WHERE (users.employeedID = userDetails.employeeID)
       AND (users.startdate = 01-01-2013) as LoginCount
 FROM userDetails

现在，这个查询工作得很完美，因为它提供了正确的登录次数，并作为整数失败。但是，我想将这些整数用作字符串，因此我可以使用一列。有一个原因，为什么这需要是一列作为字符串。

我想只有4列，而不是5.我想要的登录列是loginCountFailed / LoginCount。例如：3/12。我需要它作为一个字符串，因为你不能除以0，有时候分母是0。

Answer 1

要在MSSQL-2005中连接数字，您应该使用CAST

CAST(loginsFailed AS VARCHAR(10)) + '/' + CAST(LoginCount AS VARCHAR(10))

登录失败，上面的loginCount实际上是您的select count distinct碎片

我希望这有效

CAST ((SELECT COUNT(DISTINCT loginsFailed) FROM users WHERE users.employeedID = userDetails.employeeID AND users.startdate = 01-01-2013) AS VARCHAR(10))
+ '/' +
CAST ((SELECT COUNT(DISTINCT logins) FROM users WHERE users.employeedID = userDetails.employeeID AND users.startdate = 01-01-2013) AS VARCHAR(10))

Answer 2

DECLARE @i int
SET @i=98235

--Method 1 : Use CAST function
SELECT CAST(@i as varchar(10))

--Method 2 : Use CONVERT function
SELECT CONVERT(varchar(10),@i)

--Method 3 : Use STR function
SELECT LTRIM(STR(@i,10))

Source

Answer 3

您可以使用CAST或CONVERT：
执行以下操作

CONVERT(VARCHAR(20), YourIntColumn)

OR

CAST(YourIntColumn AS VARCHAR(20))

Answer 4

你想要做的是有一个case语句来处理除零逻辑，而不是切换到数字数据的字符串。

SELECT employeeID
    ,name
    ,location
    ,(SELECT CASE WHEN COUNT(DISTINCT logins) = 0 then 0 ELSE
COUNT(DISTINCT loginsFailed) / COUNT(DISTINCT logins)
END
     FROM users
     WHERE (users.employeedID = userDetails.employeeID)
        AND (users.startdate = 01-01-2013) ) as LoginFailRatio
 FROM userDetails

Answer 5

我认为你可以在这里创建一个外部查询：

SELECT u.employeeID, u.name, u.location,  
       CONVERT(varchar(10), u.LoginCountFailed) + '/' + CONVERT(varchar(10), u.LoginCount) "Ratio" 
    FROM
        (
         SELECT employeeID
            ,name
            ,location
            ,(SELECT COUNT(DISTINCT loginsFailed)
             FROM users
             WHERE (users.employeedID = userDetails.employeeID)
                AND (users.startdate = 01-01-2013) as LoginCountFailed
          ,(SELECT COUNT(DISTINCT logins)
           FROM users
           WHERE (users.employeedID = userDetails.employeeID)
               AND (users.startdate = 01-01-2013) as LoginCount
         FROM userDetails
        ) u

Answer 6

我认为这会解决问题

Select column1 + '/' + column2 from table1

在SQL Select中将列转换为字符串

6 个答案: