Question

我前段时间构建了一个脚本来创建视图，而表格需要创建一个结构化视图。 SQL Server的免费版本不支持分区视图，因此我必须构建一个每晚运行的过程，创建表并根据当前数据将数据填充到每个表中，然后返回几个月的数组，6， 6-12,12-18等因为它所保存的数据太大而无法在实时系统中查询。

下面您将看到脚本中的一个关键点，它分割日期以为每个要用作视图源的分区创建表。

由于今天2月29日的6个月，这个故障实际上已经发生，这个故障今天已经发生了，这个日期在今年根本不存在！

我的问题归结为此，任何人都可以建议对下面的更正来处理不存在的日期，同时保持单独的日期范围并且不会丢失日期，以便仍然可以将任何和所有数据插入到视图中正确。这是一个艰难的。

SET @splitcount = 8

DECLARE @counter as tinyint = 1, @monthcount as tinyint, 
        @filter as nvarchar (200 ), @droptext as nvarchar(80)

WHILE @counter <= @splitcount
BEGIN
    SET @monthcount = @counter * 6
          SET @checkdate = DATEADD( month, -@monthcount , getdate ())

    SET @filter = CASE WHEN @monthcount = 6 THEN 'requesteddatetime >= CAST('''+ CONVERT (varchar ( 12), @checkdate , 112) + ''' as DATETIME) AND requesteddatetime < CAST('''+ @7days+ ''' AS DATETIME)' ELSE 'requesteddatetime >= CAST(''' +CONVERT (varchar ( 12), @checkdate , 112 )+ ''' as DATETIME) AND requesteddatetime < CAST('''+ CONVERT( varchar( 12 ), DATEADD ( month , 6, @checkdate), 112 ) + ''' AS DATETIME)'  END
    IF @counter = @splitcount
           BEGIN
                  SET @filter = 'requesteddatetime < CAST('''+CONVERT (varchar( 12), DATEADD(month , 6 , @checkdate ), 112 ) + ''' AS DATETIME)'
           END

    SET @droptext = 'DROP TABLE dbo.CustomAudit' + CAST ( @monthcount as nvarchar (50 ))+ 'Months'
    IF OBJECT_ID ('dbo.CustomAudit' +CAST ( @monthcount as nvarchar( 50))+'Months' , 'U' ) IS NOT NULL
           EXEC sp_executesql @droptext

    SET @sql = 'CREATE Table CustomAudit'+ CAST ( @monthcount as nvarchar (50 ))+'Months (
            layoutid bigint ,
            displayemployeeid nvarchar (50) NULL,
            forename nvarchar (50) COLLATE database_default ,
            surname nvarchar (50) COLLATE database_default ,
            datatablabel nvarchar (100) NOT NULL,
            requesteddatetime datetime NOT NULL CHECK (' + @filter+'),
            username nvarchar (50) COLLATE database_default ,
            updatelevel nvarchar (50) COLLATE database_default ,
            updatetype nvarchar (50) COLLATE database_default ,
            field nvarchar (100) COLLATE database_default ,
            CurrentValue nvarchar (800) COLLATE database_default ,
            Value nvarchar (800) COLLATE database_default ,
            authorised nvarchar (50) COLLATE database_default ,
            authoriserdatetime datetime ,
            authemployeedesc nvarchar (200),
            recruitment bit,
                       [ID] [uniqueidentifier] NOT NULL,
          CONSTRAINT PK_CustomAudit' +CAST ( @monthcount as nvarchar( 50))+'Months PRIMARY KEY CLUSTERED (surname, forename,requesteddatetime, ID)
   )

          CREATE NONCLUSTERED INDEX IX_' + CAST ( @monthcount as nvarchar( 50 ))+'Months_ID ON CustomAudit'+ CAST ( @monthcount as nvarchar(50 ))+'Months (displayemployeeid)
          CREATE NONCLUSTERED INDEX IX_' + CAST ( @monthcount as nvarchar( 50 ))+'Months_Label ON CustomAudit'+ CAST ( @monthcount as nvarchar(50 ))+'Months (datatablabel)'
        EXEC sp_executesql @sql
        PRINT 'dbo.CustomAudit' +CAST ( @monthcount as nvarchar( 50))+'Months Created'
        PRINT 'Filter: ' + @filter

   SET @counter = @counter + 1
END

SQL Server：自我维护的分区视图问题

0 个答案: