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    <p>Seems that you just need to change a font in SQL Developer. Check <a href="http://www.sqlfiddle.com/#!4/9b8f8/1" rel="nofollow noreferrer">this SQLFiddle</a>.</p> <p>There are two things wrong in your question text: to get unicode symbol from it's code <a href="http://docs.oracle.com/cd/B19306_01/server.102/b14200/functions091.htm" rel="nofollow noreferrer"><code>nchr()</code></a> function must be used instead of <a href="http://docs.oracle.com/cd/B19306_01/server.102/b14200/functions019.htm#i76965" rel="nofollow noreferrer"><code>chr()</code></a>. Second is that <code>'₹'</code> constant string treated as <code>varchar2</code> and to properly specify <code>nvarchar2</code> constant you <a href="http://docs.oracle.com/cd/B19306_01/server.102/b14225/ch7progrunicode.htm#i1006315" rel="nofollow noreferrer">must prepend <code>N</code></a> to this literal: <code>N'₹'</code> .</p> <p>To change font just open <code>Tools -&gt; Preferences ...</code> menu </p> <p><img src="https://i.stack.imgur.com/0T162.jpg" alt="enter image description here"></p> <p>and choose <code>Code Editor -&gt; Fonts</code> node. At this page you can select font from <code>Font Name</code> dropdown list. Copy and past rupee symbol into <code>Sample Text</code> field to quickly see if font are acceptable. Arial (on win7) works fine for me:</p> <p><img src="https://i.stack.imgur.com/vHLgS.jpg" alt="enter image description here"></p> <p>This setting changes grid font as well as font in code editor:</p> <p><img src="https://i.stack.imgur.com/Umu2I.jpg" alt="enter image description here"></p> <p>Actions above puts you only to a half of the way to get full rupee symbol support because <code>select N'₹' from dual</code> will return only question sign. This is because of query text encoding conversion done between client and server side.<br> To deal with this issue Oracle <a href="http://docs.oracle.com/cd/B19306_01/server.102/b14225/ch7progrunicode.htm#CACHHIFE" rel="nofollow noreferrer">provides ORA_NCHAR_LITERAL_REPLACE environment setting</a>. This setting guides client API to analyze query text for character constants prefixed with <code>N</code> and use special internal format to encode such a data on client side before transferring query text to server. Unfortunately SQL Developer uses Thin JDBC API which ignores this environment setting, so adding this environment variable doesn't solve a problem. </p> <p>But there are <a href="http://docs.oracle.com/cd/B19306_01/server.102/b14225/ch7progrunicode.htm#CHDCBACA" rel="nofollow noreferrer">another way</a> to turn on same behavior with <code>oracle.jdbc.convertNcharLiterals</code> property which acts on a system and connection levels.<br> To turn this property on, locate <code>ide.conf</code> file in <code>sqldeveloper\ide\bin</code> directory in SQL Developer installation folder and add this line to the end of a file:</p> <pre><code>AddVMOption -Doracle.jdbc.convertNcharLiterals=true </code></pre> <p>Save file and restart SQL Developer, all things must work now:</p> <p><img src="https://i.stack.imgur.com/AfiGU.jpg" alt="enter image description here"></p> <p>P.S. Instructions based on SQL Developer Version 3.2, old versions may have another location of configuration file. E.g. <code>sqldeveloper\bin\sqldeveloper.conf</code> .</p>
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    1. COThanks!! it worked.
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