如何获取每年每个月的最大值

Question

好吧，如果您有一个主控表任何列示例主控表列createdon，modifiedon，name，id

detailtable有createdon，modifiedon，name，id，mastertableid

现在，每个月都会自动在master上添加一行，并且它可能会有很多关于这个master的行，所以当一个用户不想等待下个月时，他会运行一个过程，在master上创建一个新行，在detail上创建其他行。so.so为这个月我将有两个主，现在我需要做一个选择只与年和月，如果我做这个选择，这第一个主自动生成和第二个主为用户生成的和细节，现在我不希望它发生，我只想要一个。我不介意这是最后一个，还是第一个，所以我需要一个

然后我的问题是，我如何选择最后创建的master？(每年的每个月)所以我不介意最后一个是为用户创建的，还是自动创建的，只是我需要最后一个master及其详细信息。

这是我当前的查询，但这是select all

SELECT 
    createdby
    , createdbyname
    , createdbyyominame
    , createdon
    , createdonutc
    , createdonbehalfby
    , createdonbehalfbyname
    , createdonbehalfbyyominame
    , importsequencenumber
    , modifiedby
    , modifiedbyname
    , modifiedbyyominame
    , modifiedon
    , modifiedonutc
    , modifiedonbehalfbyname
    , modifiedonbehalfbyyominame
    , modifiedonbehalfby
    , ope_censoid
    , ope_name
    , ope_rutasid
    , ope_rutasidname
    , organizationid
    , organizationidname
    , overriddencreatedon
    , overriddencreatedonutc
    , statecode
    , statecodename
    , StatusCode
    , statuscodename
    , timezoneruleversionnumber
    , utcconversiontimezonecode  
FROM 
    ope_censo  
ORDER BY 
    ope_censoid
    , modifiedon

我用最后一个查询得到了这个结果

createdby                               createdbyname                createdbyyominame           createdon     createdonutc createdonbehalfby   createdonbehalfbyname   createdonbehalfbyyominame   importsequencenumber    modifiedby  modifiedbyname  modifiedbyyominame  modifiedon  modifiedonutc   modifiedonbehalfbyname  modifiedonbehalfbyyominame  modifiedonbehalfby  ope_censoid ope_name    ope_rutasid ope_rutasidname organizationid
71D3CE46-1B71-E011-8C48-005056977FBC    Administrador CRM BBebidas  Administrador CRM BBebidas  2012-02-01 07:03:24.000 NULL    NULL    NULL    NULL    NULL    71D3CE46-1B71-E011-8C48-005056977FBC    Administrador CRM BBebidas  Administrador CRM BBebidas  2012-02-01 07:03:24.000 NULL    NULL    NULL    NULL    581EB2D0-A24C-E111-97AC-005056977FBC    1 - Febrero - 2012  FF7C3DBD-3EBA-E011-8C48-005056977FBC    R 197 AGUA PURIF HOG LOC    F94F39E4-7C6B-E011-8C48-005056977FBC
71D3CE46-1B71-E011-8C48-005056977FBC    Administrador CRM BBebidas  Administrador CRM BBebidas  2012-02-13 15:33:41.000 NULL    NULL    NULL    NULL    NULL    71D3CE46-1B71-E011-8C48-005056977FBC    Administrador CRM BBebidas  Administrador CRM BBebidas  2012-02-13 15:33:41.000 NULL    NULL    NULL    NULL    63FFFF15-5856-E111-97AC-005056977FBC    13 - Febrero - 2012 FF7C3DBD-3EBA-E011-8C48-005056977FBC    R 197 AGUA PURIF HOG LOC    F94F39E4-7C6B-E011-8C48-005056977FBC
71D3CE46-1B71-E011-8C48-005056977FBC    Administrador CRM BBebidas  Administrador CRM BBebidas  2012-02-24 00:29:27.000 NULL    NULL    NULL    NULL    NULL    71D3CE46-1B71-E011-8C48-005056977FBC    Administrador CRM BBebidas  Administrador CRM BBebidas  2012-02-24 00:29:27.000 NULL    NULL    NULL    NULL    3D14A09B-7E5E-E111-97AC-005056977FBC    23 - Febrero - 2012 FF7C3DBD-3EBA-E011-8C48-005056977FBC    R 197 AGUA PURIF HOG LOC    F94F39E4-7C6B-E011-8C48-005056977FBC
71D3CE46-1B71-E011-8C48-005056977FBC    Administrador CRM BBebidas  Administrador CRM BBebidas  2012-02-01 07:02:57.000 NULL    NULL    NULL    NULL    NULL    71D3CE46-1B71-E011-8C48-005056977FBC    Administrador CRM BBebidas  Administrador CRM BBebidas  2012-02-01 07:02:57.000 NULL    NULL    NULL    NULL    7F53A7C4-A24C-E111-97AC-005056977FBC    1 - Febrero - 2012  CC7C3DBD-3EBA-E011-8C48-005056977FBC    R128 AGUA PURIF HOG LOC F94F39E4-7C6B-E011-8C48-005056977FBC
71D3CE46-1B71-E011-8C48-005056977FBC    Administrador CRM BBebidas  Administrador CRM BBebidas  2012-02-13 15:33:28.000 NULL    NULL    NULL    NULL    NULL    71D3CE46-1B71-E011-8C48-005056977FBC    Administrador CRM BBebidas  Administrador CRM BBebidas  2012-02-13 15:33:28.000 NULL    NULL    NULL    NULL    49540510-5856-E111-97AC-005056977FBC    13 - Febrero - 2012 CC7C3DBD-3EBA-E011-8C48-005056977FBC    R128 AGUA PURIF HOG LOC F94F39E4-7C6B-E011-8C48-005056977FBC
71D3CE46-1B71-E011-8C48-005056977FBC    Administrador CRM BBebidas  Administrador CRM BBebidas  2012-02-24 00:37:06.000 NULL    NULL    NULL    NULL    NULL    71D3CE46-1B71-E011-8C48-005056977FBC    Administrador CRM BBebidas  Administrador CRM BBebidas  2012-02-24 00:37:06.000 NULL    NULL    NULL    NULL    753C4BAD-7F5E-E111-97AC-005056977FBC    23 - Febrero - 2012 CC7C3DBD-3EBA-E011-8C48-005056977FBC    R128 AGUA PURIF HOG LOC F94F39E4-7C6B-E011-8C48-005056977FBC
71D3CE46-1B71-E011-8C48-005056977FBC    Administrador CRM BBebidas  Administrador CRM BBebidas  2012-02-01 07:06:55.000 NULL    NULL    NULL    NULL    NULL    71D3CE46-1B71-E011-8C48-005056977FBC    Administrador CRM BBebidas  Administrador CRM BBebidas  2012-02-01 07:06:55.000 NULL    NULL    NULL    NULL    88650A4F-A34C-E111-97AC-005056977FBC    1 - Febrero - 2012  CD7C3DBD-3EBA-E011-8C48-005056977FBC    R129 AGUA PURIF HOG LOC F94F39E4-7C6B-E011-8C48-005056977FBC

因此，你可以看到对于"rutaidname“我有3次"R 197 AGUA PURIF HOG LOC”，所以你可以看到createdon是在2012年2月创建的，我想为这个"rutasidname“选择最后一个，所以，如果这个"rutaidname”有另一个月(一行或更多行)，我想要那个月的最后一个行，所以，我需要每个"rutaidname“的行，其中createdon是最后一个，为每个月，每年。例如"R 197 AGUA PURIF HOG LOC“我想要2011年2月的最后一个，”2011年3月“的最后一个母版，”2011年4月“的lsat母版。

Answer 1

在我看来，您只需要将MAX日期值按月/年分组，如下未经测试的伪代码：

SELECT
    MAX(someDate) 
    , CAST(YEAR(someDate) AS VARCHAR(4)) + CAST(MONTH(someDate) AS VARCHAR(2)) AS yearAndMonth
FROM
    someTable
GROUP BY
    CAST(YEAR(someDate) AS VARCHAR(4)) + CAST(MONTH(someDate) AS VARCHAR(2))

Answer 2

;WITH x AS
(
  SELECT d = DATEADD(MONTH, DATEDIFF(MONTH, '19000101', createdon), '19000101'),
    rn = ROW_NUMBER() OVER (PARTITION BY DATEDIFF(MONTH, '19000101', createdon)
      ORDER BY createdon), -- or ORDER BY createdon DESC, or ORDER BY id DESC 
    createdon, modifiedon, name, id, mastertableid
  FROM dbo.mastertable
)
SELECT d,modifiedon,name,id,mastertableid
FROM x
WHERE rn = 1
ORDER BY d;

使用新的需求和实际的表名/列名：

SELECT 
    createdby, createdbyname
    , createdbyyominame, createdon
    , createdonutc, createdonbehalfby
    , createdonbehalfbyname
    , createdonbehalfbyyominame
    , importsequencenumber
    , modifiedby, modifiedbyname
    , modifiedbyyominame, modifiedon
    , modifiedonutc
    , modifiedonbehalfbyname
    , modifiedonbehalfbyyominame
    , modifiedonbehalfby
    , ope_censoid
    , ope_name
    , ope_rutasid
    , ope_rutasidname
    , organizationid
    , organizationidname
    , overriddencreatedon
    , overriddencreatedonutc
    , statecode
    , statecodename
    , StatusCode
    , statuscodename
    , timezoneruleversionnumber
    , utcconversiontimezonecode  
FROM 
(
  SELECT *, rn = ROW_NUMBER() OVER (PARTITION BY ope_rutasidname, 
       DATEDIFF(MONTH, '19000101', createdon) ORDER BY createdon DESC)
  FROM dbo.ope_censo  
) AS x
WHERE rn = 1
ORDER BY ope_censoid, modifiedon;