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POMySQL DECLARE Syntax (Converting from MSSQL)
 

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    <p>MySQL Gurus,</p> <p>I'm converting some reports from a MSSQL database for usage on a MySQL Database, and don't seem to understand how the <code>DECLARE</code> works in MySQL. Below is the SQL code for the report, as works in MSSQL. I read that <code>DECLARE</code> can only be use in a nested function, I belive, but that just does not sound right to me.</p> <p>Current Report SQL: (I parse &amp; replace the values of Current &amp; Pending from my app code)</p> <pre><code>DECLARE @Current int; DECLARE @Pending int; SET @Current = [1]; SET @Pending = [3]; Select Ticket.TIcketID, ISNULL((Select LocationName from Location where LocationID = Ticket.SiteCurrentLocation), 'Invalid Location') as [Current Location], ISNULL((Select LocationName from Location where LocationID = Ticket.SitePendingLocation), 'Invalid Location') as [Pending Location] from Ticket where (SitePendingLocation &gt; 0 AND SitePendingLocation &lt;&gt; SiteCurrentLocation) AND (SiteCurrentLocation = @Current OR @Current = 0) AND (SitePendingLocation = @Pending OR @Current = 0) </code></pre> <p>Any insight?</p> <p>Thanks - Andrew</p> <p><strong>EDIT</strong></p> <p>Working, converted script - that it may help others:</p> <pre><code>SET @Current = '1'; SET @Pending = '1'; Select Ticket.TIcketID, IFNULL((Select LocationName from Location where LocationID = Ticket.SiteCurrentLocation), 'Invalid Location') as `Current Location`, IFNULL((Select LocationName from Location where LocationID = Ticket.SitePendingLocation), 'Invalid Location') as `Pending Location` from Ticket where (SitePendingLocation &gt; 0 AND SitePendingLocation &lt;&gt; SiteCurrentLocation) AND (SiteCurrentLocation = @Current OR @Current = 0) AND (SitePendingLocation = @Pending OR @Current = 0) </code></pre>
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    1. COYou can either use SET by itself (no DECLARE) or replace @ with _ (or no prefix). See http://stackoverflow.com/questions/763718/whats-wrong-with-this-mysql-statement-declare-id-int for a similar question.
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    2. COThanks @dash - no need for the `DECLARE` at all then, great! Now off to figure out what it does not like about `ISNULL`...
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    3. COIt's IFNULL ;-) - http://dev.mysql.com/doc/refman/5.0/en/control-flow-functions.html#function_ifnull
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