Question

我试图生成名为month的其他列，并创建其他记录以填充全年的月份。

此原始数据示例

ID   | DateModified
---- | ------------
123  | 01-01-2020
123  | 11-05-2020

这是理想的结果

ID  | DateModified | Month
--- | ------------ | -----
123 | 01-01-2020   | Jan
123 | 01-01-2020   | Feb
123 | 01-01-2020   | March
123 | 01-01-2020   | April
123 | 11-05-2020   | May
123 | 11-05-2020   | June
123 | 11-05-2020   | July
123 | 11-05-2020   | August
123 | 11-05-2020   | September
123 | 11-05-2020   | October
123 | 11-05-2020   | November
123 | 11-05-2020   | December

请告知如何归档这些结果。

Answer 1

您可以使用DATEADD来实现

UPDATE a
SET a.DateModified = DATEADD(MONTH, b.Month_Value, a.DateModified )   
FROM Your_Table a
INNER JOIN MonthValue_AccordingTo_MonthTextTable b ON a.Month = b.Month_Text

Answer 2

更新了答案。我希望这对您有用...请注意，它适用于同一年内的日期，而不是下一年。

CREATE TABLE wrk(
    id int,
    DateModified datetime
)
GO

INSERT INTO wrk values(123, '20200101')
INSERT INTO wrk values(123, '20200511')
GO

WITH
    months as(
        SELECT 1  AS month_idx, 'jan' AS month_key UNION ALL
        SELECT 2  AS month_idx, 'feb' AS month_key UNION ALL
        SELECT 3  AS month_idx, 'mar' AS month_key UNION ALL
        SELECT 4  AS month_idx, 'apr' AS month_key UNION ALL
        SELECT 5  AS month_idx, 'may' AS month_key UNION ALL
        SELECT 6  AS month_idx, 'jun' AS month_key UNION ALL
        SELECT 7  AS month_idx, 'jul' AS month_key UNION ALL
        SELECT 8  AS month_idx, 'aug' AS month_key UNION ALL
        SELECT 9  AS month_idx, 'sep' AS month_key UNION ALL
        SELECT 10 AS month_idx, 'oct' AS month_key UNION ALL
        SELECT 11 AS month_idx, 'nov' AS month_key UNION ALL
        SELECT 12 AS month_idx, 'dec' AS month_key
    ),
    w as(
        SELECT
            w.id, w.DateModified,
            --
            datepart(month, w.DateModified) AS MonthModifiedFrom,
            --
            isnull(
                datepart(
                    month,
                    min(w_next.DateModified)
                ) - 1,
                12 /* December */
            ) AS MonthModifiedTo
        FROM
            wrk w
                LEFT OUTER JOIN wrk w_next
                ON(
                        w_next.id = w.id
                    AND w_next.DateModified > w.DateModified
                )
        GROUP BY w.id, w.DateModified
    )
SELECT
    w.id, w.DateModified, m.month_key
FROM
    w
        INNER JOIN months m
        ON m.month_idx BETWEEN w.MonthModifiedFrom AND w.MonthModifiedTo

根据修改日期填写月份日期

2 个答案: