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    <p>I <em>think</em> I understand now, what you are looking for. You want the <strong>numeric components sorted as numbers</strong>, not strings. This should work for you:</p> <pre><code>SELECT col1 FROM tbl ORDER BY string_to_array( replace(replace(replace(replace(replace(replace( col1 , 'chrx', 'chr22') , 'chry', 'chr23') , 'chrmt', 'chr24') , 'chr6_ux9', 'chr6.6') , ' chr', 'chr') , 'chr', '') , ',')::real[]; </code></pre> <p>Sorts columns as depicted in the questin. The textual component ('chr') turns out to be redundant noise. After applying all replacements, I strip the noise and cast to a numeric array which can be used in the <code>ORDER BY</code> clause.</p> <p>While performing the listed substitutions, the special case for <code>chr6_ux9</code> forces the use of <code>real[]</code> instead of the simpler and faster <code>int[]</code>, because the <code>integer</code> type leaves no room between <code>6</code> and <code>7</code>. You also have one column with a space instead of a comma. I added a substitution for that, too. But that's probably just a typo. After removing the irrelevant string <code>chr</code>, only comma-separated numbers remain, which can be cast to <code>real[]</code>.</p> <p>BTW, <a href="http://www.postgresql.org/docs/current/interactive/functions-string.html#FUNCTIONS-STRING-OTHER" rel="nofollow"><code>replace()</code></a> is very fast. I have functions with dozens of <code>replace()</code> operations in a row that still perform fast. (<code>regexp_replace()</code> is much slower.)</p> <hr> <h3>Alternative answer for sorting individual elements</h3> <p>For a sorted output of <strong>all</strong> values as <strong>strings</strong>:</p> <pre><code>SELECT regexp_split_to_table(replace(replace(replace( col1 ,'chrx', 'chr22') ,'chry', 'chr23') ,'chrmt', 'chr24') , ',') AS col1 FROM tbl ORDER BY 1 </code></pre> <p><code>chr6_ux9</code> comes after <code>chr6</code> automatically in this scenario.</p>
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    1. POORDER BY column containing a mix of text and numerical data
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    1. USErwin Brandstetter
    1. USErwin Brandstetter
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    1. COThanks Erwin, for your quick response. I tried your code but not able to get alpha numeric sorting
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      1. USSivaram Chintalapudi
    2. COThanks Erwin. Your solution is working fine. In fact i struggled for last 3 days to find a solution.You gave me a excellent solution.
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      1. USSivaram Chintalapudi
 

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