Question

我已经创建了一个SQL视图＆amp;该视图提供了数据库表Data中的某些列。现在，我想以这样一种方式修改该视图，即它不需要在结果中添加任何其他列。应该与之前生成的视图完全匹配。我想要的唯一修改是：视图从PayDate表中获取了一个名为Data的列。我需要该列具有值，具体取决于名为OrderType的其他列。 Data表格如下：

Book    OrderType   PayDate      ValuDate
-------------------------------------------
FFF     CA          21/05/2015   NULL
BBB     CO          NULL         2/02/2014
EEE     IO          NULL         3/2/2014
QQQ     Dividend    02/02/2014   NULL

目前，该视图提供了OrderType＆amp;结果Paydate。这里有麻烦，OrderType = 'CA' OR 'Dvidend'我们有PayDate。对于OrderType = 'CO' OR 'IO'，我们有ValuDate。每次'CO'或'IO'得到的值都是NULL。所以我在这里想要一个CASE来检查OrderType是'CO'还是'IO'它将在PayDate列中返回ValuDate。在OrderType为'CA'或'Dividend'的地方，在PayDate列的Data列中为PayDate表提供ValuDate的值。

PS：不想在此处添加ValueDate列。如果PayDate是'CO'或'IO'，那么我们只需将OrderType的值放在IF EXISTS (SELECT * FROM sys.views WHERE object_id = OBJECT_ID(N'[dbo].[ABC]')) BEGIN DROP VIEW [dbo].[ABC] PRINT '<<< DROPPED VIEW [dbo].[ABC] >>>' END GO SET ANSI_NULLS ON GO SET QUOTED_IDENTIFIER ON GO CREATE VIEW [dbo].[ABC] AS SELECT ISNULL(Book, '') + '_' + ISNULL(OrderType,'') + '_' + ISNULL(CONVERT(VARCHAR(8), PayDate, 112), '') + '_' MAX(t.[InstrumentKey]) [InstrumentKey] , MAX(t.[BookKey]) [BookKey] , t.[OrderType], MAX(t.[InstrumentID]) [InstrumentID] , t.PayDate , FROM dbo.Data t (NOLOCK) LEFT OUTER JOIN dbo.ExtInstrument i ON t.InstrumentKey = i.InstrumentKey WHERE [STATUS] = 'LIVE' GROUP BY Book , OrderType , PayDate , BackToBackBook GO PRINT '<<< CREATED VIEW [dbo].[ABC] >>>' GRANT SELECT ON dbo.ABC TO INVENTORY_READERS GO PRINT '<<< GRANT SELECT ON VIEW [dbo].[ABC] TO INVENTORY_READERS >>>' GO列的视图中

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Answer 1

试着按照你的要求去做。这是你的意思吗？

CREATE VIEW [dbo].[ABC]
AS

SELECT  ISNULL(Book, '') + '_' + ISNULL(OrderType,'') + '_'
        + ISNULL(CONVERT(VARCHAR(8), PayDate, 112), '') + '_'
        MAX(t.[InstrumentKey]) [InstrumentKey] ,
        MAX(t.[BookKey]) [BookKey] ,
        t.[OrderType],
        MAX(t.[InstrumentID]) [InstrumentID] ,
        CASE WHEN OrderType in ('CO','IO') THEN t.ValuDate ELSE t.PayDate END AS PayDate,
        FROM    dbo.Data t (NOLOCK)
LEFT OUTER JOIN dbo.ExtInstrument i ON t.InstrumentKey = i.InstrumentKey

WHERE [STATUS] = 'LIVE'

GROUP BY Book ,
        OrderType ,
        CASE WHEN OrderType in ('CO','IO') THEN t.ValuDate ELSE t.PayDate END ,
        BackToBackBook

编辑：我怀疑第一部分需要

SELECT  ISNULL(Book, '') + '_' + ISNULL(OrderType,'') + '_'
        + ISNULL(CONVERT(VARCHAR(8), CASE WHEN OrderType in ('CO','IO') THEN t.ValuDate ELSE t.PayDate END, 112), '') + '_'

Answer 2

这是我所做的。但我想使用'UNION'＆amp;修改视图。我们可以使用UNION来修改这个视图吗？

IF  EXISTS (SELECT * FROM sys.views WHERE object_id = OBJECT_ID(N'[dbo].[ABC]'))
BEGIN
    DROP VIEW [dbo].[ABC]
    PRINT '<<< DROPPED VIEW [dbo].[ABC] >>>'
END
GO  

SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO

CREATE VIEW [dbo].[ABC]
AS


SELECT  ISNULL(Book, '') + '_' + ISNULL(OrderType,'') + '_'
        + ISNULL(t.RIC, '') + '_'
        + CASE OrderType
                            WHEN OrderType = 'PNoteCorporateAction' OR 'PNoteDividendDraft' OR 'PNoteDividend' THEN ISNULL(CONVERT(VARCHAR(8), PayDate, 112), '') 
            ELSE ISNULL(CONVERT(VARCHAR(8), ValuDate, 112), '') 
          END AS PayDate + '_'  
        MAX(t.[InstrumentKey]) [InstrumentKey] ,
        MAX(t.[BookKey]) [BookKey] ,
        t.[OrderType],
        MAX(t.[InstrumentID]) [InstrumentID] ,
        t.PayDate ,
        FROM    dbo.Data t (NOLOCK)
LEFT OUTER JOIN dbo.ExtInstrument i ON t.InstrumentKey = i.InstrumentKey

WHERE [STATUS] = 'LIVE'

GROUP BY Book ,
        OrderType ,
        CASE WHEN OrderType = 'PNoteCorporateAction' OR 'PNoteDividendDraft' OR 'PNoteDividend' THEN PayDate ELSE ValueDate END AS PayDate,
        BackToBackBook 


GO
PRINT '<<< CREATED VIEW [dbo].[ABC] >>>'

GRANT SELECT ON dbo.ABC TO INVENTORY_READERS
GO

PRINT '<<< GRANT SELECT ON  VIEW [dbo].[ABC] TO  INVENTORY_READERS  >>>'
GO

需要帮助修改SQL视图

2 个答案: