DYNAMIC UNION表

Question

我想創建一個動態表，我不必每月都更新表名。因爲我有相同的查詢工作（沒有變化，但表名稱，格式爲（dbo.tablename_201705）至（dbo.tablename_201706）等等。所以我創造了這個

DECLARE @TABLE_NAME VARCHAR(20) 
SET @TABLE_NAME ='dbo.GTI_'+left (convert(varchar,dateadd(mm,-3, getdate()-7), 112) ,6) 

DECLARE @GTI_SQL_REPORT VARCHAR(255) 
SET @GTI_SQL_REPORT = 'select*from '+@TABLE_NAME. 

，從這裏我丟失我不知道下一步 這裏下面是我的查詢

Select 
    [CountryID], 
    COUNT([Document name]) as [inputcount], 
    MONTH([Creation Date]) AS [Creation Month], 
    Year([Creation Date]) as [Creation Year] 
from 
    dbo.GTI_201705 
WHERE 
    [doc_type_product_type] not in ('CUST') 
    and [Document_Source] in ('FAX','Original') 
group by 
    [CountryID], 
    MONTH([Creation Date]) , 
    Year([Creation Date]) 
order by 
    [CountryID]; 

這樣的想法是創建一個動態表，以便該查詢將在每個月初運行。預先感謝您

Answer 1

您近距離了...您只需要設置@GTI_SQL_REPORT到varchar(max)，然後將查詢設置爲它。 varchar(255)將不足以容納您的動態字符串。注意底部的print(@GTI_SQL_REPORT)。首先這樣做是明智的，所以你會看到你正在執行的SQL。一旦你滿意......然後只是評論一下，取消註釋EXEC命令。

DECLARE @TABLE_NAME VARCHAR(20) 
SET @TABLE_NAME ='dbo.GTI_'+left (convert(varchar,dateadd(mm,-3, getdate()-7), 112) ,6) 

DECLARE @GTI_SQL_REPORT VARCHAR(max) 
SET @GTI_SQL_REPORT = 
    'Select 
     [CountryID], 
     COUNT([Document name]) as [inputcount], 
     MONTH([Creation Date]) AS [Creation Month], 
     Year([Creation Date]) as [Creation Year] 
    from ' + @TABLE_NAME + ' 
    WHERE 
     [doc_type_product_type] not in (''CUST'') 
     and [Document_Source] in (''FAX'',''Original'') 
    group by 
     [CountryID], 
     MONTH([Creation Date]) , 
     Year([Creation Date]) 
    order by 
    [CountryID]; ' 

print(@GTI_SQL_REPORT) 
--exec(@GTI_SQL_REPORT)