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POHow to combine data from different tables using a query
 

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  1. POHow to combine data from different tables using a query
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    <p>I have a set of tables that look like what I have shown below.</p> <p>Could you let me know how I can achive the desired output ?</p> <pre><code>CREATE TABLE #ABC([Year] INT, [Month] INT,Customer Varchar(10), SalesofProductA INT); CREATE TABLE #DEF([Year] INT, [Month] INT,Customer Varchar(10), SalesofProductB INT); CREATE TABLE #GHI([Year] INT, [Month] INT,Customer Varchar(10), SalesofProductC INT); INSERT #ABC VALUES (2013,1,'PPP',1); INSERT #ABC VALUES (2013,1,'QQQ',2); INSERT #ABC VALUES (2013,2,'PPP',3); INSERT #DEF VALUES (2013,1,'QQQ',4); INSERT #DEF VALUES (2013,1,'RRR',5); INSERT #DEF VALUES (2013,2,'PPP',6); INSERT #GHI VALUES (2013,1,'QQQ',7); INSERT #GHI VALUES (2013,2,'RRR',8); INSERT #GHI VALUES (2013,3,'PPP',9); INSERT #GHI VALUES (2013,3,'QQQ',10); </code></pre> <p>I have a query currently that looks like this . @Month and @Year are supplied as parameters</p> <pre><code>SELECT -- select the sum for each year/month combination using a correlated subquery (each result from the main query causes another data retrieval operation to be run) (SELECT SUM(SalesofProductA) FROM #ABC WHERE [Year]=T.[Year] AND [Month]=T.[Month]) AS [Sum_SalesofProductA] ,(SELECT SUM(SalesofProductB) FROM #DEF WHERE [Year]=T.[Year] AND [Month]=T.[Month]) AS [Sum_SalesofProductB] ,(SELECT SUM(SalesofProductC) FROM #GHI WHERE [Year]=T.[Year] AND [Month]=T.[Month]) AS [Sum_SalesofProductC] FROM ( -- this selects a list of all possible dates. SELECT [Year],[Month] FROM #ABC where Year = @Year and Month = @Month UNION SELECT [Year],[Month] FROM #DEF where Year = @Year and Month = @Month UNION SELECT [Year],[Month] FROM #GHI where Year = @Year and Month = @Month ) AS T; </code></pre> <p>Right now I see an output like this : for a particular value of @Month and @Year</p> <pre><code> SalesofProductA, SalesofProductB, SalesofProductC </code></pre> <p>What I would like to see is :</p> <pre><code>[Customer],SalesofProductA, SalesofProductB, SalesofProductC </code></pre> <p>Does anyone know how it can be done ?</p>
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    1. COWhy have you tagged this question with three versions of SQL Server? Are you looking for a solution for every one of the three?
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