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POMerging two datatable in memory and grouping them to get sum of columns.Using linq but kind of lost here
 

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  1. POMerging two datatable in memory and grouping them to get sum of columns.Using linq but kind of lost here
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    <p>I have two table where two column are fixed. Some columns are identical and some are new.<strong>Columns are dynamic.</strong></p> <p><strong>Have to do it in code level and I am trying to loop and conditions</strong></p> <p>What I want is to generate a report following the condition,</p> <ul> <li>All columns in table1 and table2 must be present.</li> <li>If a column is common and value is there it should be added with the identical row in other table.</li> <li>If any row is present in one table but not in other, it should be included.</li> </ul> <p><strong>Example data</strong></p> <p>Table1</p> <pre><code>ID | NAME | P1 | P2 | P3 ---------------------------- 1 | A1 | 1 | 2 | 3.3 2 | A2 | 4.4 | 5 | 6 </code></pre> <p>TABLE 2 </p> <pre><code> ID | NAME | P1 | P2 | P4 --------------------------- 1 | A1 | 10 | 11 | 12 2 | A2 | 12 | 14 | 15 3 | A3 | 16 | 17 | 18 </code></pre> <p>Expected output:</p> <pre><code> ID | NAME | P1 | P2 | P3 | P4 --------------------------------- 1 | A1 | 11 | 13 | 3.3 | 12 2 | A2 | 16.4 | 19 | 6 | 15 3 | A3 | 16 | 17 | null| 18 </code></pre> <p>Progress till now:</p> <p>First I merged those two table in to table1 <code>table1.Merge(table2)</code></p> <p>Then trying to group by over it</p> <pre><code>var query = from row in table1.AsEnumerable() group row by new { ID = row.Field&lt;int&gt;("ID"), Name = row.Field&lt;string&gt;("Name") } into grp select new { ID = grp.Key.ID, Name = grp.Key.Name, Phase1 = grp.Sum(r =&gt; r.Field&lt;decimal&gt;("P1")) }; </code></pre> <p>I have modified this code to get a datatable. <strong>Please see attached cs file.</strong><br> This is working, but as the number of columns are dynamic, I guess I have to repeat it for other columns and join all these small tables where one columns will be added.</p> <p>How can I merge all those small tables?</p> <p>I am lost here.Is there any other way. Its feeling as stupid thing.</p> <p>Any help would be appreciated.</p> <p>Attached File:</p> <hr> <p><a href="http://dl.dropbox.com/u/26252340/Program.cs" rel="nofollow">http://dl.dropbox.com/u/26252340/Program.cs</a></p>
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      1. POMerging two datatable in memory and grouping them to get sum of columns.Using linq but kind of lost here
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    1. COThere isn't really a clean solution to this if you have dynamic columns. Mainly because needing dynamic columns usually means there is a better way of storing the data. And if it was done correctly, would likely provide a much easier way to query for the data you want.
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