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POMySQL delete except one
 

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    <p>I've the following database structure:</p> <pre><code>id idproperty idgbs 1 1 136 2 1 128 3 1 10 4 1 1 5 2 136 6 2 128 7 2 10 8 2 1 9 3 561 10 3 560 11 3 10 12 3 1 13 4 561 14 4 560 15 4 10 16 4 1 17 5 234 18 5 120 19 5 1 20 6 234 21 6 120 22 6 1 </code></pre> <p>Here are the details:</p> <p>The table refers <code>idproperty</code> with different geographic location. For example: </p> <pre><code>idgbs 1 refers to United States 10 refers to Alabama with parentid 1 (United States) 128 refers to Alabama Gulf Coast with parentid 10 (Alabama) 136 Dauphin Island with parentid 128 (Alabama Gulf Coast) </code></pre> <p>So, the structure is:</p> <pre><code>United States &gt; Alabama &gt; Alabama Gulf Coast &gt; Dauphin Island </code></pre> <p>I want to delete all entries for idproperty EXCEPT the first with the set of idgbs 136, 128, 10, 1 i.e. leave atleast 1 property in all GBS and delete others.</p> <p>Also, sometimes it is 4 level of geographic entries, sometimes it is 3 level.</p> <p>Please share the logic &amp; SQL query to delete all entries except one in every unique GBS.</p> <p>GBS 1, 10, 128, 136 is one unique, so database should only contain 1 property id with these GBS.</p> <p>After the query, the table would look like this:</p> <pre><code>id idproperty idgbs 1 1 136 2 1 128 3 1 10 4 1 1 9 3 561 10 3 560 11 3 10 12 3 1 17 5 234 18 5 120 19 5 1 </code></pre> <p>Rephrasing the question:</p> <p>I want to keep properties in every root level GBS i.e. there should be only ONE property in Dauphin Island. </p>
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    1. COSo DELETE FROM YourTable where idproperty <> 1 ?
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      1. USStefan H
    2. CO@StefanH - I think you misunderstood. I just want entries in my table with unique set of idgbs. For ex. entries with idgbs - 1, 10, 128, 136 should only be one for one property and not multiple properties.
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    3. COPlease show what you expect to be there after this sql is run, sort of a before and after - that will make things much more clear.
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