在SQL Azure中使用临时表

Question

我正在编写一个查询来旋转表元素,其中列名是动态生成的.

SET @query = N'SELECT STUDENT_ID, ROLL_NO, TITLE, STUDENT_NAME, EXAM_NAME, '+
            @cols +
            ' INTO ##FINAL 
            FROM
            (
                SELECT  *
                FROM #AVERAGES
                UNION 
                SELECT  *
                FROM #MARKS 
                UNION
                SELECT  *
                FROM #GRACEMARKS
                UNION
                SELECT  *
                FROM #TOTAL
                ) p
                PIVOT
                (
                MAX([MARKS])
                FOR SUBJECT_ID IN
                ( '+
                @cols +' )
            ) AS FINAL
            ORDER BY STUDENT_ID ASC, DISPLAYORDER ASC, EXAM_NAME ASC;'

EXECUTE(@query) 

select * from ##FINAL 

此查询在我的本地数据库中正常工作,但它在SQL Azure中不起作用,因为那里不允许全局临时表.

现在,如果我将##FINAL 更改为#FINAL我的本地数据库,但它给我错误

无效的对象名称'#FINAL'.

我该如何解决这个问题？

Answer 1

好吧,在说我不认为可以做到之后,我可能有办法.虽然这很难看.希望您可以使用以下示例并使其适应您的查询(没有您的架构和数据,对我来说,尝试编写它太棘手了):

declare @cols varchar(max)
set @cols = 'object_id,schema_id,parent_object_id'

--Create a temp table with the known columns
create table #Boris (
    ID int IDENTITY(1,1) not null
)
--Alter the temp table to add the varying columns. Thankfully, they're all ints.
--for unknown types, varchar(max) may be more appropriate, and will hopefully convert
declare @tempcols varchar(max)
set @tempcols = @cols
while LEN(@tempcols) > 0
begin
    declare @col varchar(max)
    set @col = CASE WHEN CHARINDEX(',',@tempcols) > 0 THEN SUBSTRING(@tempcols,1,CHARINDEX(',',@tempcols)-1) ELSE @tempcols END
    set @tempcols = CASE WHEN LEN(@col) = LEN(@tempcols) THEN '' ELSE SUBSTRING(@tempcols,LEN(@col)+2,10000000) END
    declare @sql1 varchar(max)
    set @sql1 = 'alter table #Boris add [' + @col + '] int null'
    exec (@sql1)
end

declare @sql varchar(max)
set @sql = 'insert into #Boris (' + @cols + ') select ' + @cols + ' from sys.objects'
exec (@sql)

select * from #Boris

drop table #Boris

它们的关键是在外部作用域中创建临时表,然后内部作用域(在EXEC语句中运行的代码)可以访问相同的临时表.以上工作在SQL Server 2008上,但我没有Azure实例可供使用,所以没有在那里测试.