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POT-SQL ORDER BY according to a condition
 

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    <p>I am writing some sort of resources management system.</p> <p>A resource is an instance of a definition. A definition is the metadata, basically it contains the properties.</p> <p>This is in general my DB:</p> <pre><code>TypeDefinition id name =============== 1 CPU PropertyDefinition id name typeDefinitionId valueType ================================================ 1 frequency 1 int 2 status 1 string TypeInstance id name typeDefinitionId ================================= 1 CPU#1 1 2 CPU#2 1 PropertyInstanceValue id propertyDefinitionId typeInstanceId valueType intValue StringValue FloatValue ======================================================================================== 1 1 1 int 10 2 2 1 string Pending 3 1 2 int 20 4 2 2 string Approved </code></pre> <p><em><strong>REQUIREMENT:</em></strong></p> <p>order all resources according to a <strong>specific property value</strong>.</p> <p>For example: order all resources according to their <strong>status</strong> --> Meaning CPU#2 will appear before CPU#1 because “Approved” is before “Pending”.</p> <p>If we were to order according to <strong>frequency</strong>, CPU#1 will appear before CPU#2 because 10 is before 20.</p> <p>So I need to sort each time according to a different column (intValue / stringValue/ FloatValue / etc), depending on the property's valueType.</p> <p>Any suggestion?</p> <p><em><strong>LIMITATION:</em></strong></p> <p>PIVOT is currently the only option we've thought of, but it's not really possible since the DB is huge and I need the query to be as fast as possible.</p> <p>Thanks a lot in advance,</p> <p>Michal.</p>
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    1. USClockwork-Muse
    1. USMichal
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    1. COPost the code you have so far, and let us know where you are stuck
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      1. USPete Carter
    2. COLooks like you have a particularily nasty form of an [EAV](http://en.wikipedia.org/wiki/Entity%E2%80%93attribute%E2%80%93value_model) setup. You also have a denormalization problem, which may come back to bite you (because `valueType` is duplicated in `PropertyInstanceValue`). You aren't going to need pivot (and would it consistently order _columns_, anyways?), this can be done with nothing but joins and some correlated result tables, so long as you write it for one column. But are you solely interested in the _alphabetic_ order of the status, or some other criteria?
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      1. USClockwork-Muse
 

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