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POUNION generate duplicate rows
 

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    <p>I know that By default <code>UNION</code> does'nt generate duplicate rows. But in this case as I used the column <code>sort_col</code> for sorting purpose and that way <code>UNION</code> generate duplicate rows(actually not duplicate as <code>sort_col</code> is distinct in each <code>select</code>). To clarifie see this answer and the <a href="https://stackoverflow.com/a/8582591/2826057"><strong>comments</strong></a> also How to overcome this?</p> <pre><code>$key_word_1 = $what; $key_word_2 = $what."%"; $key_word_3 = "%".$what."%"; (SELECT 1 AS sort_col, chair.id_user, chair.company, chair.district, chair.summary, chair.place, products.name FROM chair LEFT JOIN products ON chair.id_user = products.id_user WHERE ( chair.district LIKE ? AND chair.place LIKE ? ) AND ( chair.company LIKE ? OR chair.summary LIKE ? OR products.name LIKE ? OR products.description LIKE ? ) GROUP BY chair.id_user) UNION (SELECT 2, chair.id_user, chair.company, chair.district, chair.summary, chair.place, products.name FROM chair LEFT JOIN products ON chair.id_user = products.id_user WHERE ( chair.district LIKE ? AND chair.place LIKE ? ) AND ( chair.company LIKE ? OR chair.summary LIKE ? OR products.name LIKE ? OR products.description LIKE ? ) GROUP BY chair.id_user) UNION (SELECT 3, chair.id_user, chair.company, chair.district, chair.summary, chair.place, products.name FROM chair LEFT JOIN products ON chair.id_user = products.id_user WHERE ( chair.district LIKE ? AND chair.place LIKE ? ) AND ( chair.company LIKE ? OR chair.summary LIKE ? OR products.name LIKE ? OR products.description LIKE ? ) GROUP BY chair.id_user) ORDER BY sort_col LIMIT ?, ? </code></pre>
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