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<h1>Labels and SQL Expressions</h1>
<p>Labels are generated by using SQL expressions. The «SQL expression» is added to WHERE clause of view feed query. You can match on ttrss_entries table fields and even use subselect to query additional information. This functionality is considered to be advanced and requires some understanding of SQL.</p>
<h2>Examples</h2>
<p>Match all unread articles:</p>
<pre>unread = true</pre>
<p>Matches all articles which mention Linux in the title:</p>
<pre>ttrss_entries.title like '%Linux%'</pre>
<p>See the database schema included in the distribution package for gruesome
details.</p>
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