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_posts/2011-10-16-csql-perform-sql-queries-on-csv-data.html
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title: "csql: perform sql queries on csv data"
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<!-- no summary found -->
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</head>
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<body>
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The websites I operate are flat-file based, so when I want to store
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data it's easiest to write it in csv format. But it's not particularly easy
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to make queries on this data without additional software.
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<p>I'd rather not fire up Open Office or try to figure out how to make awk
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parse a quoted excel-format file, so I wrote 'csql', which reads a csv
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file into an in-memory sql database, performs a query, and then writes
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the result also in csv format.
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<p>A short example:
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<p>rsvp.csv:
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<blockquote><pre>
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Buffy Summers,false,0
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Xander Harris,true,2
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Willow Rosenberg,true,1
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</pre></blockquote>
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<p>rsvp.cols:
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<blockquote><pre>
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name text
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attend boolean
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count integer
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</pre></blockquote>
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<p>Performing queries:
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<blockquote><pre>
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$ csql rsvp.csv 'select sum(count) from t where attend="true"'
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3
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$ csql rsvp.csv 'select name from t where attend="true"'
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Xander Harris
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Willow Rosenberg
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</pre></blockquote>
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<p><p><b>Files currently attached to this page:</b>
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<table cellpadding=5 style="width:auto!important; clear:none!important"><col><col style="text-align: right"><tr bgcolor=#eeeeee><td><a href="https://media.unpythonic.net/emergent-files/01318779088/csql">csql</a></td><td>3.4kB</td></tr></table><p>
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<p><br><br><font size=-2>Entry first conceived on 16 October 2011, 15:31 UTC, last modified on 15 January 2012, 3:46 UTC</font>
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</body>
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</html>
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