Like problem - Mailing list pgsql-sql

<div class="Section1"><p class="MsoNormal"><font face="Arial" size="2"><span style="font-size:10.0pt;
font-family:Arial">8.2.5</span></font><p class="MsoNormal"><font face="Arial" size="2"><span style="font-size:10.0pt;
font-family:Arial">I am having an issue with trying to use ‘LIKE’ so that I can match on a string with an underscore in
it. What is the proper way to find the following string?</span></font><p class="MsoNormal"><font face="Arial"
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font-family:Arial"> </span></font><p class="MsoNormal"><font face="Arial" size="2"><span style="font-size:10.0pt;
font-family:Arial">Table t1</span></font><p class="MsoNormal"><font face="Arial" size="2"><span
style="font-size:10.0pt;
font-family:Arial">Column c1</span></font><p class="MsoNormal"><font face="Arial" size="2"><span
style="font-size:10.0pt;
font-family:Arial">String I want to match on ‘abc_’</span></font><p class="MsoNormal"><font face="Arial" size="2"><span
style="font-size:10.0pt;
font-family:Arial"> </span></font><p class="MsoNormal"><font face="Arial" size="2"><span style="font-size:10.0pt;
font-family:Arial">SELECT c1 FROM t1 WHERE c1 LIKE ‘%abc\_%’;</span></font><p class="MsoNormal"><font face="Arial"
size="2"><spanstyle="font-size:10.0pt; 
font-family:Arial"> </span></font><p class="MsoNormal"><font face="Arial" size="2"><span style="font-size:10.0pt;
font-family:Arial">This gives me the following message:</span></font><p class="MsoNormal"><font face="Arial"
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font-family:Arial"> </span></font><p class="MsoNormal"><font face="Arial" size="2"><span style="font-size:10.0pt;
font-family:Arial">WARNING:  nonstandard use of escape in a string literal</span></font><p class="MsoNormal"><font
face="Arial"size="2"><span style="font-size:10.0pt; 
font-family:Arial">LINE 1: ...ct c1 from t1 where c1 like '%abc\_%';</span></font><p class="MsoNormal"><font
face="Arial"size="2"><span style="font-size:10.0pt; 
font-family:Arial"> </span></font><p class="MsoNormal"><font face="Arial" size="2"><span style="font-size:10.0pt;
font-family:Arial">Remember I want an actual underscore.</span></font><p class="MsoNormal"><font face="Arial"
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font-family:Arial"> </span></font><p class="MsoNormal"><font face="Arial" size="2"><span style="font-size:10.0pt;
font-family:Arial">Lance Campbell</span></font><p class="MsoNormal"><font face="Arial" size="2"><span
style="font-size:10.0pt;
font-family:Arial">Project Manager/Software Architect</span></font><p class="MsoNormal"><font face="Arial"
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font-family:Arial">Web Services at Public Affairs</span></font><p class="MsoNormal"><font face="Arial" size="2"><span
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font-family:Arial">217.333.0382</span></font><p class="MsoNormal"><font face="Arial" size="2"><span
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