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Question

的動態SQL值

我正在使用動態查詢，我需要表中的值。

我到目前爲止查詢：

DECLARE @query varchar(1500) 
SET @query = 
'SELECT Id,' 
+ 'SUM(CASE WHEN ['+convert(varchar(50),CAST(myTable.myDate AS date),120)+'] = ['+convert(varchar(50), CAST(GETDATE() AS date), 120)+'] then [Counter] else 0 end) ''0'',' 
+ 'SUM(CASE WHEN ['+convert(varchar(50),CAST(DATEADD(day, -1, myTable.myDate)), 120)+'] = ['+convert(varchar(50),CAST(DATEADD(day, -1, GETDATE()) AS date), 120)+'] then [counter] else 0 end) ''1'',' 
+ 'SUM(CASE WHEN ['+convert(varchar(50),CAST(DATEADD(day, -2, myTable.myDate)), 120)+'] = ['+convert(varchar(50),CAST(DATEADD(day, -2, GETDATE()) AS date), 120)+'] then [counter] else 0 end) ''2'',' 
+ 'SUM(CASE WHEN ['+convert(varchar(50), CAST(DATEADD(day, -3, myTable.myDate)), 120)+'] = ['+convert(varchar(50),CAST(DATEADD(day, -3, GETDATE()) AS date),120)+'] then [counter] else 0 end) ''3'',' 
+ 'SUM(CASE WHEN ['+convert(varchar(50),CAST(DATEADD(day, -4, myTable.myDate)),120)+'] = ['+convert(varchar(50),CAST(DATEADD(day, -4, GETDATE()) AS date),120)+'] then [counter] else 0 end) ''4''' 
+ 'FROM [myTable] GROUP BY Id' 
PRINT(@query) 
EXEC(@query) 

這不會工作，因爲它說：「多聲部identifyer‘myTable的’無法綁定。」在4-8行。

我見過的人recomending是這樣的：

CREATE TABLE #tmp 
(
    id varchar(50), 
    counter int, 
    myDate smalldatetime 
) 
Insert Into #tmp (id, counter, myDate) 
SELECT * FROM myTable 
--GO      --doesn't work either with or without 'go' 
DECLARE @query varchar(1500) 
SET @query = 
'SELECT Id,' 
+ 'SUM(CASE WHEN ['+convert(varchar(50),CAST(#tmp.myDate AS date),120)+'] = ['+convert(varchar(50), CAST(GETDATE() AS date), 120)+'] then [counter] else 0 end) ''0'',' 
+ 'SUM(CASE WHEN ['+convert(varchar(50),CAST(DATEADD(day, -1, #tmp.myDate)), 120)+'] = ['+convert(varchar(50),CAST(DATEADD(day, -1, GETDATE()) AS date), 120)+'] then [counter] else 0 end) ''1'',' 
+ 'SUM(CASE WHEN ['+convert(varchar(50),CAST(DATEADD(day, -2, #tmp.myDate)), 120)+'] = ['+convert(varchar(50),CAST(DATEADD(day, -2, GETDATE()) AS date), 120)+'] then [counter] else 0 end) ''2'',' 
+ 'SUM(CASE WHEN ['+convert(varchar(50),CAST(DATEADD(day, -3, #tmp.myDate)), 120)+'] = ['+convert(varchar(50),CAST(DATEADD(day, -3, GETDATE()) AS date),120)+'] then [counter] else 0 end) ''3'',' 
+ 'SUM(CASE WHEN [+'convert(varchar(50),CAST(DATEADD(day, -4, #tmp.myDate)), 120)+'] = ['+convert(varchar(50),CAST(DATEADD(day, -4, GETDATE()) AS date),120)+'] then [aounter] else 0 end) ''4''' 
+ 'FROM [myTable] GROUP BY Id' 
PRINT(@query) 
EXEC(@query) 

還不行。請幫忙！

簡化版本，我的問題：

DECLARE @query varchar(1500) 
SET @query = 'SELECT ['+myTable.value+'] FROM [myTable]' 
EXEC(@query) 

不起作用

Answer 1

嘗試是這樣的：

CREATE TABLE #tmp 
(
    id varchar(50), 
    counter int, 
    myDate smalldatetime 
) 
Insert Into #tmp (id, counter, myDate) 
SELECT * FROM myTable 

DECLARE @query varchar(1500) 
Select @query = 
'SELECT Id,' 
+ 'SUM(CASE WHEN ''' + convert(varchar(50), #tmp.myDate,120) + ''' = '''+convert(varchar(50), GETDATE(), 120)+''' then ''counter'' else 0 end) ''0'',' 
+ 'SUM(CASE WHEN '''+convert(varchar(50), DATEADD(day, -1, #tmp.myDate), 120)+''' = '''+convert(varchar(50),DATEADD(day, -1, GETDATE()), 120)+''' then ''counter'' else 0 end) ''1'',' 
+ 'SUM(CASE WHEN '''+convert(varchar(50), DATEADD(day, -2, #tmp.myDate), 120)+''' = '''+convert(varchar(50),DATEADD(day, -2, GETDATE()), 120)+''' then ''counter'' else 0 end) ''2'',' 
+ 'SUM(CASE WHEN '''+convert(varchar(50), DATEADD(day, -3, #tmp.myDate), 120)+''' = '''+convert(varchar(50),DATEADD(day, -3, GETDATE()), 120)+''' then ''counter'' else 0 end) ''3'',' 
+ 'SUM(CASE WHEN '''+convert(varchar(50), DATEADD(day, -4, #tmp.myDate), 120)+''' = '''+convert(varchar(50),DATEADD(day, -4, GETDATE()), 120)+''' then ''counter'' else 0 end) ''4''' 
+ ' FROM ' from #tmp 
Set @query = @query + ' #tmp GROUP BY Id' 
PRINT(@query) 
EXEC(@query)