需要帮助使用 DATEADD 仅显示当前日期之后的列日期

Question

目前正在编写查询以提取员工周年纪念日。到目前为止，我可以提取 5、10、15 和 25 年的日期，但我试图只提取当前日期之后的周年纪念日。有任何想法吗？

SELECT
    HireDate, 
    DATEADD(year, 5, HireDate)  AS '5_Year_Anniversary',
    DATEADD(year, 10, HireDate) AS '10_Year_Anniversary',
    DATEADD(year, 15, HireDate) AS '15_Year_Anniversary',
    DATEADD(year, 25, HireDate) AS '25_Year_Anniversary'
FROM
    EMPTABLE;

Answer 1

SELECT
    HireDate, 
    case when DATEADD(year, 5, HireDate) >= getdate() --check to see if the anniversary is on or after the current date
         then DATEADD(year, 5, HireDate) 
         else NULL end  AS '5_Year_Anniversary' --etc, repeat for your other columns
FROM
    EMPTABLE
where DATEADD(year, 25, HireDate) >= getdate() --to filter out employees where all anniversary columns would be NULL

使用像上面这样的案例语句应该可行，具体取决于您希望在员工已过周年纪念日时为这些列显示什么值。如果您在这些情况下需要特定值，则可能需要 cast/convert 周年纪念日。

例如：

SELECT
    HireDate, 
    case when DATEADD(year, 5, HireDate) >= getdate() --check to see if the anniversary is on or after the current date
         then cast(DATEADD(year, 5, HireDate)  as varchar(20))
         else 'Already Passed' end  AS '5_Year_Anniversary' --etc, repeat for your other columns
FROM
    EMPTABLE
where DATEADD(year, 25, HireDate) >= getdate() --to filter out employees where all anniversary columns would be NULL

Answer 2

比较每个周年纪念日，仅当周年纪念日晚于当前日期时才显示。

SELECT 语句是解决方案。如果日期已过，字段将 return NULL。

CREATE TABLE #EMPTABLE
(
    HireDate datetime
)
GO

INSERT INTO #EMPTABLE
VALUES
    ('2018-01-01'),
    ('2013-01-01'),
    ('2008-01-01'),
    ('2003-01-01'),
    ('1993-01-01')
GO


SELECT
    GETDATE() [Current Date],
    HireDate, 
    CASE WHEN ( DATEADD(year, 5, HireDate) > GETDATE() )
        THEN DATEADD(year, 5, HireDate)
        ELSE NULL
    END AS [5_Year_Anniversary],
    CASE WHEN ( DATEADD(year, 10, HireDate) > GETDATE() )
        THEN DATEADD(year, 10, HireDate)
        ELSE NULL
    END AS [10_Year_Anniversary],
    CASE WHEN ( DATEADD(year, 15, HireDate) > GETDATE() )
        THEN DATEADD(year, 15, HireDate)
        ELSE NULL
    END AS [15_Year_Anniversary],
    CASE WHEN ( DATEADD(year, 25, HireDate) > GETDATE() )
        THEN DATEADD(year, 25, HireDate)
        ELSE NULL
    END AS [25_Year_Anniversary]
FROM
    #EMPTABLE
GO

需要帮助使用 DATEADD 仅显示当前日期之后的列日期

Needing help using DATEADD to only display column dates after current date

sql

sql-server

date

dateadd