Question

我试图弄清楚如何修改查询以仅显示满足条件的值。

我的查询：

SELECT
    name = r.RscMaster_Name_Ch
    ,Start_date = a.assign_from_da
    ,End_date = a.Assign_Thru_Da
FROM DW_WFTS.dbo.Assign_Tbl a
LEFT JOIN DW_WFTS.dbo.Resource_Master_Tbl r ON r.RscMaster_No_In = a.RscMaster_No_In
WHERE
    (
        a.Assign_Thru_Da >= GETDATE()
        OR a.Assign_Thru_Da IS NULL
        OR
        (
            a.Assign_From_Da >= GETDATE()
            AND a.Assign_Thru_Da >= GETDATE()
        )
        OR
        (
            a.Assign_From_Da <= GETDATE()
            AND a.Assign_Thru_Da <= GETDATE()
        )
    )
    AND
    (
        (
            a.Assign_From_Da LIKE '0%'
            OR a.Assign_From_Da LIKE '00%'
            OR a.Assign_From_Da LIKE '000%'
        )
        OR
        (
            a.Assign_Thru_Da LIKE '0%'
            OR a.Assign_Thru_Da LIKE '00%'
            OR a.Assign_Thru_Da LIKE '000%'
        )
    );

因此，如果有一个或多个用户使用了错误的日期格式-输入为'0YYY'或'00YY'或'000Y'的任何年份-我希望查询显示名称并且仅显示错误的日期，例如

name       Start_date     end_date
John       0019-12-01
Jane                       0020-01-05
Mike       0019-01-05      0019-12-01

我不确定如何从选择中省略正确的日期。请帮忙。

Answer 1

如果您的担忧只是一年中的前导零

“输入为'0YYY'或'00YY'或'000Y'的任何年份”

并且它们的类型为DATE，那么您将到达那里：

SELECT
    name = r.RscMaster_Name_Ch
    ,Start_date = a.assign_from_da
    ,End_date = a.Assign_Thru_Da
FROM DW_WFTS.dbo.Assign_Tbl a
LEFT JOIN DW_WFTS.dbo.Resource_Master_Tbl r ON r.RscMaster_No_In = a.RscMaster_No_In
where
    a.assign_from_da < '1000-01-01'
    or a.Assign_Thru_Da < '1000-01-01'

如果您有更多的日期规则，则可以扩展where子句

Answer 2

您可以使用ISDATE（）函数。对于无效日期的字符表达式，它返回零。

SELECT name = r.RscMaster_Name_Ch ,Start_date = a.assign_from_da ,End_date = a.Assign_Thru_Da FROM DW_WFTS.dbo.Assign_Tbl a LEFT JOIN DW_WFTS.dbo.Resource_Master_Tbl r ON r.RscMaster_No_In = a.RscMaster_No_In WHERE ISDATE( a.assign_from_da ) = 0 OR ISDATE( a.Assign_Thru_Da ) = 0

Answer 3

SQL Server中的DATE类型支持从0001-01-01到9999-12-31的值。 SMALLDATETIME类型允许从1900-01-01到2079-06-06的值。您可以使用TRY_CAST()尝试转换为SMALLDATETIME，然后将其转换回日期。从1900-01-01到2079-06-06之外的所有值都将返回NULL。

SELECT
    name = r.RscMaster_Name_Ch
    ,Start_date = CAST(TRY_CAST(a.assign_from_da AS SMALLDATETIME) AS DATE)
    ,End_date = CAST(TRY_CAST(a.Assign_Thru_Da AS SMALLDATETIME) AS DATE)
FROM DW_WFTS.dbo.Assign_Tbl a
LEFT JOIN DW_WFTS.dbo.Resource_Master_Tbl r ON r.RscMaster_No_In = a.RscMaster_No_In
WHERE
    (
        ISNULL(a.Assign_Thru_Da, DATEADD(DAY,1,GETDATE())) >= GETDATE()
        OR
        (
            a.Assign_From_Da >= GETDATE()
            AND a.Assign_Thru_Da >= GETDATE()
        )
        OR
        (
            a.Assign_From_Da <= GETDATE()
            AND a.Assign_Thru_Da <= GETDATE()
        )
    )

然后您可以像下面这样将此查询插入您的sp_send_dbmail呼叫中：

BEGIN

IF @count > 0

BEGIN

    EXEC msdb.dbo.sp_send_dbmail
    --@profile_name='emailFrsdata2',
    @recipients=N'won.chang@montgomerycountymd.gov',
    @subject = 'WFTS - Incorrect Assignment Dates found',
    @query = N'SELECT
                    name = r.RscMaster_Name_Ch
                    ,Start_date = CAST(TRY_CAST(a.assign_from_da AS SMALLDATETIME) AS DATE)
                    ,End_date = CAST(TRY_CAST(a.Assign_Thru_Da AS SMALLDATETIME) AS DATE)
                FROM DW_WFTS.dbo.Assign_Tbl a
                LEFT JOIN DW_WFTS.dbo.Resource_Master_Tbl r ON r.RscMaster_No_In = a.RscMaster_No_In
                WHERE
                    (
                        ISNULL(a.Assign_Thru_Da, DATEADD(DAY,1,GETDATE())) >= GETDATE()
                        OR
                        (
                            a.Assign_From_Da >= GETDATE()
                            AND a.Assign_Thru_Da >= GETDATE()
                        )
                        OR
                        (
                            a.Assign_From_Da <= GETDATE()
                            AND a.Assign_Thru_Da <= GETDATE()
                        )
                    )
                ORDER BY r.RscMaster_Name_Ch',
    @attach_query_result_as_file = 0

END 

END

SQL Server：仅显示满足条件的值

3 个答案: