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    <h1>8. SQL Reference</h1>
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		<a name="QUALIFIEDNAMES" />
    <h2>8.6. Qualified Names</h2>
		
			<a name="qual_owners" />
    <h3>8.6.1. Qualifiers and Owners</h3>
			<p>
Virtuoso supports multiple namespaces for tables and procedures.  A table
or procedure is uniquely identified by a three part name consisting of
qualifier, owner and name separated by dots.
</p>
			<p>
Each connection has a current qualifier which is used as the default
qualifier for if a name does not specify a qualifier.  The owner can
be omitted from a name if the qualifier and name uniquely identify the
object, e.g.  DB..SYS_KEYS.
</p>
			<p>
Initially, all system objects have the qualifier DB and owner DBA.
</p>
			<p>
The default current qualifier of all connections is DB unless otherwise
specified using db.dba.user_set_qualifier.
</p>
			<p>
A user can be assigned a default qualifier set as current qualifier upon
login.  This is done with the stored procedure db.dba.user_set_qualifier.
</p>
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user_set_qualifier  (in user varchar, in qualifier varchar)
</pre>
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    <h3>8.6.2. Default Qualifiers</h3>
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The default qualifier of the user is set to be the qualifier.  The names
are strings and thus case sensitive.
</p>
			<p>Example:</p>
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      <pre class="programlisting">
db..user_set_qualifier (&#39;U1&#39;, &#39;U1DATA&#39;);
</pre>
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    <h3>8.6.3. USE Statement, USE identifier</h3>
			<p>
This sets the default qualifier for the connection in question.  The
identifier cannot be an expression. The identifier
is subject to whatever case conversions may be in effect.
</p>
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				<div class="tiptitle">See Also:</div>
				<p>
        <a href="catidentifiers.html">CaseMode Configuration parameter</a>.</p>
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			<p>
A quoted identifier will always pass in the
case it is entered. An unquoted identifier will be converted to upper
case if CaseMode so specifies.
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