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POhow to do inner join and right outer join in the same query
 

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  1. POhow to do inner join and right outer join in the same query
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    <p>I have these 3 tables:</p> <ol> <li>FeatureTbl (FeatureId (PK),FeatureName)</li> <li>ParameterTbl (ParameterId (PK),ParameterName)</li> <li>Map_Parameter_To_Feature (MapId (PK),FeatureId(FK),ParameterId(FK))</li> </ol> <p>I want to convert the following SQL to LINQ:</p> <pre class="lang-sql prettyprint-override"><code>SELECT FeatureTbl.FeatureId, FeatureTbl.FeatureName, Map_Parameter_To_Feature.ParameterId, ParameterTbl.ParameterName FROM ParameterTbl INNER JOIN Map_Parameter_To_Feature ON ParameterTbl.ParameterId = Map_Parameter_To_Feature.ParameterId RIGHT OUTER JOIN FeatureTbl ON Map_Parameter_To_Feature.FeatureId = FeatureTbl.FeatureId </code></pre> <p>The above query returns the following result</p> <pre class="lang-none prettyprint-override"><code>FeatureId,FeatureName,ParameterId,ParameterName 1 Feat A NULL NULL 2 Feat B 10 Param X 3 Feat B 10 Param Y 4 Feat C NULL NULL </code></pre> <p>I wrote the following LINQ:</p> <pre class="lang-csharp prettyprint-override"><code>(from p in context.ParameterTbls join mp2f in context.Map_Parameter_To_Feature on p.ParameterId equals mp2f.ParameterId join f in context.FeatureTbls on mp2f.FeatureId equals f.FeatureId into desiredresult from r in desiredresult.DefaultIfEmpty() select new { r.FeatureId, r.FeatureName, mp2f.ParameterId, p.ParameterName }); </code></pre> <p>But I get this result</p> <pre class="lang-none prettyprint-override"><code>FeatureId,FeatureName,ParameterId,ParameterName 2 Feat B 10 Param X 3 Feat B 10 Param Y </code></pre> <p>How can I convert the above SQL to LINQ?</p>
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    1. USGolfWolf
    1. USshresthaal
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      1. POhow to do inner join and right outer join in the same query
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    1. COthis may help: http://www.hookedonlinq.com/OuterJoinSample.ashx
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      1. USxQbert
 

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