如何在 T-sql 中的 IF 中使用 select 语句

Question

谁能帮我在 SQL 的 IF 语句中使用 select 的语法。当我在 IF 中使用 BEGIN 和 END 时出现错误。

    ALTER PROCEDURE Proc1 @MonthSelection AS INT = 0
AS
BEGIN
      IF (@MonthSelection = 0)
        BEGIN
            SELECT
                YEAR([EventStartDate]) AS [Year]
                ,MONTH([EventStartDate]) AS [Month Number]
                ,DATENAME(MONTH,DateAdd( month ,MONTH([EventStartDate]), 0 ) - 1) AS [Month]
                ,COUNT([UserID]) AS [Total Number of Logins]
            FROM [Table1]
            WHERE eventtype ='login'
            GROUP BY YEAR([EventStartDate])
                    ,MONTH([EventStartDate])
            ORDER BY YEAR([EventStartDate])
                    ,MONTH([EventStartDate]
        END
        ELSE
        BEGIN
            SELECT
                    YEAR([EventStartDate]) AS [Year]
                    ,MONTH([EventStartDate]) AS [Month Number]
                    ,DATENAME(MONTH,DateAdd( month ,MONTH([EventStartDate]), 0 ) - 1) AS [Month]
                    ,COUNT([UserID]) AS [Total Number of Logins]
                FROM [Table1]
                WHERE eventtype ='login'
                        AND MONTH([EventStartDate]) = @MonthSelection
                GROUP BY YEAR([EventStartDate])
                        ,MONTH([EventStartDate])
                ORDER BY YEAR([EventStartDate])
                        ,MONTH([EventStartDate]
        END
END

我确实尝试过不使用 Begin 和 END ，但我仍然遇到错误。这段代码放在存储过程中。

Answer 1

您在 END 关键字之前缺少右括号。

这个：

...

 ORDER BY YEAR([EventStartDate])
                        ,MONTH([EventStartDate]
        END
END

收件人：

...

 ORDER BY YEAR([EventStartDate])
                        ,MONTH([EventStartDate])
        END
END

如何在 T-sql 中的 IF 中使用 select 语句

How to use select statements with in IF in T-sql

sql

tsql