Question

我目前正努力让我的查询在两行显示两个日期。即我有两行，两列为两个日期。我需要一行为null然后日期，第二行有日期然后为null。示例如下图所示 - 每行只需显示其中一个日期。

到目前为止，谷歌并不是我的朋友，因为尝试向搜索引擎描述它是一件相当模糊的事情。任何帮助将不胜感激。完整查询如下：

    WITH CTE AS
 (
 SELECT *,
        ROW_NUMBER() OVER(PARTITION BY person_code ORDER BY unit_instance_code) AS rn
 FROM learner_aims
 )

SELECT DISTINCT p.person_code [ID],
p.forename [Forename],
        p.surname [Surname],
        uio.long_description [CourseDesc],
    CASE rn
    WHEN 1 THEN NULL
    WHEN 2 THEN CONVERT(DATE, sub.[GIL Start Date], 103) 
    END AS [GIL Start Date],
    CASE rn
    WHEN 1 THEN CONVERT(DATE, sub.[Non-GIL Start Date], 103)
    WHEN 2 THEN NULL
    END AS [Non-GIL Start Date]
--    CONVERT(DATE, sub.[GIL Start Date], 103) [GIL Start Date],
--    CONVERT(DATE, sub.[Non-GIL Start Date], 103) [Non-GIL Start Date]
FROM people p
INNER JOIN learner_aims la ON p.person_code = la.person_code
INNER JOIN unit_instance_occurrences uio ON uio.uio_id = la.uio_id
INNER JOIN cte ON cte.person_code = p.person_code
LEFT JOIN (SELECT DISTINCT p.person_code [ID],
    p.forename [Forename],
    p.surname [Surname],
  MIN(fy22.earlieststartdate) [GIL Start Date],
  MIN(fy22sub.earlieststartdate) [Non-GIL Start Date]
FROM people p
INNER JOIN learner_aims la ON p.person_code = la.person_code
INNER JOIN unit_instance_occurrences uio ON uio.uio_id = la.uio_id
LEFT OUTER JOIN (
    SELECT p.person_code [ID],
        p.forename [Forename],
        p.surname [Surname],
        uio.course_occurrence_code [CourseCode],
        uio.long_description [CourseDesc],
        uio.owning_organisation [OwningOrg],
        uio.offering_organisation [OfferingOrg],
        la.uio_id [uio_id],
        MIN(CONVERT(DATE, la.start_date, 103)) [EarliestStartDate]
    FROM people p
    INNER JOIN learner_aims la ON p.person_code = la.person_code
    INNER JOIN unit_instance_occurrences uio ON uio.uio_id = la.uio_id
    WHERE la.ilr = 'Y'
        AND la.funding_year = '22'
        AND (
            uio.course_occurrence_code LIKE 'GIL%'
            OR uio.course_occurrence_code LIKE 'SEED%'
            )
    GROUP BY p.person_code,
        p.forename,
        p.surname,
        uio.course_occurrence_code,
        uio.long_description,
        uio.owning_organisation,
        uio.offering_organisation,
        la.uio_id
    ) [FY22] ON fy22.id = la.person_code
LEFT OUTER JOIN (
    SELECT p.person_code [ID],
        p.forename [Forename],
        p.surname [Surname],
        uio.course_occurrence_code [CourseCode],
        uio.long_description [CourseDesc],
        uio.owning_organisation [OwningOrg],
        uio.offering_organisation [OfferingOrg],
        la.uio_id [uio_id],
        MIN(CONVERT(DATE, la.start_date, 103)) [EarliestStartDate]
    FROM people p
    INNER JOIN learner_aims la ON p.person_code = la.person_code
    INNER JOIN unit_instance_occurrences uio ON uio.uio_id = la.uio_id
    WHERE la.ilr = 'Y'
        AND la.funding_year = '22'
        AND uio.course_occurrence_code NOT LIKE 'GIL%'
        AND uio.course_occurrence_code NOT LIKE 'SEED%'
        AND la.person_code IN (
            SELECT la.person_code [ID]
            FROM people p
            INNER JOIN learner_aims la ON p.person_code = la.person_code
            INNER JOIN unit_instance_occurrences uio ON uio.uio_id = la.uio_id
            WHERE la.ilr = 'Y'
                AND la.funding_year = '22'
                AND (
                    uio.course_occurrence_code LIKE 'GIL%'
                    OR uio.course_occurrence_code LIKE 'SEED%'
                    )
            )
    GROUP BY p.person_code,
        p.forename,
        p.surname,
        uio.course_occurrence_code,
        uio.long_description,
        uio.owning_organisation,
        uio.offering_organisation,
        la.uio_id
    ) [FY22SUB] ON fy22sub.id = la.person_code
WHERE la.funding_year = '22' AND la.ilr = 'Y'
GROUP BY p.person_code,
        p.forename,
        p.surname
HAVING MIN(CONVERT(DATE, fy22sub.earlieststartdate, 103)) > MIN(CONVERT(DATE, fy22.earlieststartdate, 103))
) sub ON sub.id = la.person_code
WHERE la.funding_year = '22' AND la.ilr = 'Y'
ORDER BY 3, 2

Answer 1

不清楚是什么决定行是第一行还是第二行，我是在第二列的文本基础上做的，因为它是唯一改变的行。

所以这里的想法是枚举行（按2排序），然后根据需要显示日期：

 declare @t table (id int, CourseDesc varchar(100), [GIL Start Date] date, [Non-GIL Start Date] date);
 insert into @t values(21571, 'text1', '20151116', '20160222'), (21571, 'text2', '20151116', '20160222');

 with cte as
 (
 select *,
        row_number() over(partition by id order by CourseDesc)as rn
 from @t
 )

 select id, CourseDesc,
        case rn
                when 1 then null
                when 2 then [GIL Start Date]
        end as [GIL Start Date],
        case rn
                when 1 then [Non-GIL Start Date]
                when 2 then null
        end as [Non-GIL Start Date]
from cte;

SQL Server - 在两个不同的行上显示两个不同的日期

1 个答案: