Sql 包含带有干净select语句的联合的视图

由于对SQL非常陌生，我正在努力扩展下面的查询，因为我在下面的查询中需要另一个条件，所以我决定尝试在语句的ELSE部分使用另一个CASE。 我将通过以下声明：

 /* AZURE_COMMENT_START */
IF NOT EXISTS(SELECT * FROM sys.databases WHERE name = 'Caring')
    CREATE DATABASE [Caring]
GO

USE [Caring]
GO
/* AZURE_COMMENT_END */


IF EXISTS (SELECT 1 FROM sys.views WHERE [name] = 'tlv_plannings')
    DROP VIEW [tlv_plannings]
GO

CREATE VIEW tlv_plannings AS 
(

    SELECT
    AanvragenPlanningBase.[Id] AS [Id],
    2 AS [Weekday],
    [FrequentieMao] AS [FrequentieMorning],
    [FrequentieMam] AS [FrequentieAfternoon],
    AanvragenPlanningBase.[Startdate] AS [Startdate],
    ISNULL(AanvragenPlanningBase.[Enddate], '9999-12-31') AS [Enddate],
    CASE WHEN AanvragenPlanningBase.KdvOpvangtijdId IS NOT NULL THEN ov1.MondayMorning ELSE ov2.MondayMorning END AS [MorningTime], 
    CASE WHEN AanvragenPlanningBase.KdvOpvangtijdId IS NOT NULL THEN ov1.MondayAfternoon ELSE ov2.MondayAfternoon END AS [AfternoonTime], 
    AanvragenPlanningBase.MondayMorning AS [PlanningMorning],
    AanvragenPlanningBase.MondayAfternoon AS [PlanningAfternoon],
    CASE WHEN AanvragenPlanningBase.KdvOpvangtijdId IS NOT NULL THEN ov1.Startdate ELSE ov2.Startdate END AS [OpvangStartdate],
    CASE WHEN AanvragenPlanningBase.KdvOpvangtijdId IS NOT NULL THEN ISNULL(ov1.Enddate, '9999-12-31') ELSE  ISNULL(ov2.Enddate, '9999-12-31') END AS [OpvangEnddate]
    FROM AanvragenPlanningBase
    LEFT OUTER JOIN OnderhoudKdvOpvangtijdBase kov on AanvragenPlanningBase.KdvOpvangtijdId = kov.Id
    LEFT OUTER JOIN OnderhoudOpvangtijdBase ov1 ON ov1.KdvOpvangtijdId = kov.Id
    LEFT OUTER JOIN OnderhoudBSoOpvangtijdBase bov on AanvragenPlanningBase.BSOOpvangtijdId = bov.Id
    LEFT OUTER JOIN OnderhoudOpvangtijdBase ov2 ON ov2.BsoOpvangtijdId = bov.Id
    UNION 
    SELECT
    AanvragenPlanningBase.[Id] AS [Id],
    3 AS [Weekday],
    [FrequentieDio] AS [FrequentieMorning],
    [FrequentieDim] AS [FrequentieAfternoon],
    AanvragenPlanningBase.[Startdate] AS [Startdate],
    ISNULL(AanvragenPlanningBase.[Enddate], '9999-12-31') AS [Enddate],
    CASE WHEN AanvragenPlanningBase.KdvOpvangtijdId IS NOT NULL THEN ov1.TuesdayMorning ELSE ov2.TuesdayMorning END AS [MorningTime], 
    CASE WHEN AanvragenPlanningBase.KdvOpvangtijdId IS NOT NULL THEN ov1.TuesdayAfternoon ELSE ov2.TuesdayAfternoon END AS [AfternoonTime], 
    AanvragenPlanningBase.TuesdayMorning AS [PlanningMorning],
    AanvragenPlanningBase.TuesdayAfternoon AS [PlanningAfternoon],
    CASE WHEN AanvragenPlanningBase.KdvOpvangtijdId IS NOT NULL THEN ov1.Startdate ELSE ov2.Startdate END AS [OpvangStartdate],
    CASE WHEN AanvragenPlanningBase.KdvOpvangtijdId IS NOT NULL THEN ISNULL(ov1.Enddate, '9999-12-31') ELSE  ISNULL(ov2.Enddate, '9999-12-31') END AS [OpvangEnddate]
    FROM AanvragenPlanningBase
    LEFT OUTER JOIN OnderhoudKdvOpvangtijdBase kov on AanvragenPlanningBase.KdvOpvangtijdId = kov.Id
    LEFT OUTER JOIN OnderhoudOpvangtijdBase ov1 ON ov1.KdvOpvangtijdId = kov.Id
    LEFT OUTER JOIN OnderhoudBSoOpvangtijdBase bov on AanvragenPlanningBase.BSOOpvangtijdId = bov.Id
    LEFT OUTER JOIN OnderhoudOpvangtijdBase ov2 ON ov2.BsoOpvangtijdId = bov.Id
    UNION 
    SELECT
    AanvragenPlanningBase.[Id] AS [Id],
    4 AS [Weekday],
    [FrequentieWoo] AS [FrequentieMorning],
    [FrequentieWom] AS [FrequentieAfternoon],
    AanvragenPlanningBase.[Startdate] AS [Startdate],
    ISNULL(AanvragenPlanningBase.[Enddate], '9999-12-31') AS [Enddate],
    CASE WHEN AanvragenPlanningBase.KdvOpvangtijdId IS NOT NULL THEN ov1.WednesdayMorning ELSE ov2.WednesdayMorning END AS [MorningTime], 
    CASE WHEN AanvragenPlanningBase.KdvOpvangtijdId IS NOT NULL THEN ov1.WednesdayAfternoon ELSE ov2.WednesdayAfternoon END AS [AfternoonTime], 
    AanvragenPlanningBase.WednesdayMorning AS [PlanningMorning],
    AanvragenPlanningBase.WednesdayAfternoon AS [PlanningAfternoon],
    CASE WHEN AanvragenPlanningBase.KdvOpvangtijdId IS NOT NULL THEN ov1.Startdate ELSE ov2.Startdate END AS [OpvangStartdate],
    CASE WHEN AanvragenPlanningBase.KdvOpvangtijdId IS NOT NULL THEN ISNULL(ov1.Enddate, '9999-12-31') ELSE  ISNULL(ov2.Enddate, '9999-12-31') END AS [OpvangEnddate]
    FROM AanvragenPlanningBase
    LEFT OUTER JOIN OnderhoudKdvOpvangtijdBase kov on AanvragenPlanningBase.KdvOpvangtijdId = kov.Id
    LEFT OUTER JOIN OnderhoudOpvangtijdBase ov1 ON ov1.KdvOpvangtijdId = kov.Id
    LEFT OUTER JOIN OnderhoudBSoOpvangtijdBase bov on AanvragenPlanningBase.BSOOpvangtijdId = bov.Id
    LEFT OUTER JOIN OnderhoudOpvangtijdBase ov2 ON ov2.BsoOpvangtijdId = bov.Id
    UNION 
    SELECT
    AanvragenPlanningBase.[Id] AS [Id],
    5 AS [Weekday],
    [FrequentieDoo] AS [FrequentieMorning],
    [FrequentieDom] AS [FrequentieAfternoon],
    AanvragenPlanningBase.[Startdate] AS [Startdate],
    ISNULL(AanvragenPlanningBase.[Enddate], '9999-12-31') AS [Enddate],
    CASE WHEN AanvragenPlanningBase.KdvOpvangtijdId IS NOT NULL THEN ov1.ThursdayMorning ELSE ov2.ThursdayMorning END AS [MorningTime], 
    CASE WHEN AanvragenPlanningBase.KdvOpvangtijdId IS NOT NULL THEN ov1.ThursdayAfternoon ELSE ov2.ThursdayAfternoon END AS [AfternoonTime], 
    AanvragenPlanningBase.ThursdayMorning AS [PlanningMorning],
    AanvragenPlanningBase.ThursdayAfternoon AS [PlanningAfternoon],
    CASE WHEN AanvragenPlanningBase.KdvOpvangtijdId IS NOT NULL THEN ov1.Startdate ELSE ov2.Startdate END AS [OpvangStartdate],
    CASE WHEN AanvragenPlanningBase.KdvOpvangtijdId IS NOT NULL THEN ISNULL(ov1.Enddate, '9999-12-31') ELSE  ISNULL(ov2.Enddate, '9999-12-31') END AS [OpvangEnddate]
    FROM AanvragenPlanningBase
    LEFT OUTER JOIN OnderhoudKdvOpvangtijdBase kov on AanvragenPlanningBase.KdvOpvangtijdId = kov.Id
    LEFT OUTER JOIN OnderhoudOpvangtijdBase ov1 ON ov1.KdvOpvangtijdId = kov.Id
    LEFT OUTER JOIN OnderhoudBSoOpvangtijdBase bov on AanvragenPlanningBase.BSOOpvangtijdId = bov.Id
    LEFT OUTER JOIN OnderhoudOpvangtijdBase ov2 ON ov2.BsoOpvangtijdId = bov.Id
    UNION 
    SELECT
    AanvragenPlanningBase.[Id] AS [Id],
    6 AS [Weekday],
    [FrequentieVro] AS [FrequentieMorning],
    [FrequentieVrm] AS [FrequentieAfternoon],
    AanvragenPlanningBase.[Startdate] AS [Startdate],
    ISNULL(AanvragenPlanningBase.[Enddate], '9999-12-31') AS [Enddate],
    CASE WHEN AanvragenPlanningBase.KdvOpvangtijdId IS NOT NULL THEN ov1.FridayMorning ELSE ov2.FridayMorning END AS [MorningTime], 
    CASE WHEN AanvragenPlanningBase.KdvOpvangtijdId IS NOT NULL THEN ov1.FridayAfternoon ELSE ov2.FridayAfternoon END AS [AfternoonTime], 
    AanvragenPlanningBase.MondayMorning AS [PlanningMorning],
    AanvragenPlanningBase.MondayAfternoon AS [PlanningAfternoon],
    CASE WHEN AanvragenPlanningBase.KdvOpvangtijdId IS NOT NULL THEN ov1.Startdate ELSE ov2.Startdate END AS [OpvangStartdate],
    CASE WHEN AanvragenPlanningBase.KdvOpvangtijdId IS NOT NULL THEN ISNULL(ov1.Enddate, '9999-12-31') ELSE  ISNULL(ov2.Enddate, '9999-12-31') END AS [OpvangEnddate]
    FROM AanvragenPlanningBase
    LEFT OUTER JOIN OnderhoudKdvOpvangtijdBase kov on AanvragenPlanningBase.KdvOpvangtijdId = kov.Id
    LEFT OUTER JOIN OnderhoudOpvangtijdBase ov1 ON ov1.KdvOpvangtijdId = kov.Id
    LEFT OUTER JOIN OnderhoudBSoOpvangtijdBase bov on AanvragenPlanningBase.BSOOpvangtijdId = bov.Id
    LEFT OUTER JOIN OnderhoudOpvangtijdBase ov2 ON ov2.BsoOpvangtijdId = bov.Id
)

因此，问题出现在以下部分

---

现在我想在这里输入另一个case select，但是语法方面有很多问题（请原谅），因为我想匹配这个查询中的列数。我如何才能以干净的方式正确地执行此操作

如果您的意思是您有几种可能性使用

[OpvangEnddate]

，那么您可能想要这样的东西。我添加了回车，以明确

CASE…END

结构可以有许多子句：

CASE 
    WHEN AanvragenPlanningBase.KdvOpvangtijdId IS NOT NULL 
      THEN ISNULL(ov1.Enddate, '9999-12-31') 
    WHEN 'something else' = 'is true'
      THEN 'some other value'
    ELSE  
      ISNULL(ov2.Enddate, '9999-12-31') 
END AS [OpvangEnddate]

---

9999-12-31

？这不完全符合Y10k……我无法从问题中看出问题所在。您是否收到错误或意外数据？@Marc抱歉，这是一个我必须调整的查询，所以不是我的代码，而是您的right@Karl我期待着一个错误（也得到它），但我发现所有的案例选择有点混乱和丑陋

CASE 
    WHEN AanvragenPlanningBase.KdvOpvangtijdId IS NOT NULL 
      THEN ISNULL(ov1.Enddate, '9999-12-31') 
    WHEN 'something else' = 'is true'
      THEN 'some other value'
    ELSE  
      ISNULL(ov2.Enddate, '9999-12-31') 
END AS [OpvangEnddate]