Question

有人可以在SQL中的IF语句中帮助我使用select语法。当我在IF中使用BEGIN和END时，我收到错误。

    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

我确实尝试过使用Begin和ENd，但我仍然收到错误。这段代码放在存储过程中。

Answer 1

您在END关键字之前错过了一个右括号。

此：

...

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

要：

...

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

如何在T-sql中使用IF中的select语句

1 个答案: