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POMySQL UNION query Syntax issue
 

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  1. POMySQL UNION query Syntax issue
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    <p>Let's say that I want to get records from 2 different tables (which have the same structure) by using UNION.</p> <p>The query is something like this :</p> <pre><code>SELECT * FROM ( (SELECT `a1`.`title`, `a1`.`updated_date`, `a1`.`plain_description`, `a1`.`thumb`, `a1`.`link`, `c1`.`alias` as category_alias FROM (`articles1` as a1) LEFT JOIN `article_categories1` as c1 ON `c1`.`id`=`a1`.`category_id` WHERE `a1`.`visible` = 1 AND `c1`.`alias` = 'category-alias' AND `c1`.`visible` = 1) UNION (SELECT `a2`.`title`, `a2`.`updated_date`, `a2`.`plain_description`, `a2`.`thumb`, `a2`.`link`, `c2`.`alias` as category_alias FROM (`articles2` as a2) LEFT JOIN `article_categories2` as c2 ON `c2`.`id`=`a2`.`category_id` WHERE `a2`.`visible` = 1 AND `c2`.`visible` = 1) ) as t ORDER BY t.updated_date DESC LIMIT 0, 5 </code></pre> <p>When I execute the query it shows :</p> <pre><code>[Err] 1064 - You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'LEFT JOIN `article_categories2` as c2 ON `c2`.`id`=`a2`.`category_id` </code></pre> <p>What was wrong here?</p> <pre><code>**`UPDATED`** </code></pre> <p>Remove parentheses in sub queries solved the problem. Just one more thing, how could I add a field to each record that would tell me which table it belong to. Assume that I want to have something like this:</p> <pre><code>id | title | link | table ----------------------------------------------------- 1 | Title 1 | somelink.html | articles1 2 | Title 2 | link2 .html | articles2 3 | Title 3 | link3 .html | articles1 </code></pre>
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