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<h1 align="center">SQL As Understood By SQLite</h1><p><a href="lang.html">[Top]</a></p><h2>Database Object Name Resolution</h2>
<p>
In SQLite, a database object (a table, index, trigger or view) is identified
by the name of the object and the name of the database that it resides in.
Database objects may reside in the main database, the temp database, or in
an <a href="lang_attach.html">attached database</a>.
<p>
The syntax of the <a href="lang_droptable.html">DROP TABLE</a>, <a href="lang_dropindex.html">DROP INDEX</a>, <a href="lang_dropview.html">DROP VIEW</a>, <a href="lang_droptrigger.html">DROP TRIGGER</a>,
<a href="lang_reindex.html">REINDEX</a>, <a href="lang_altertable.html">ALTER TABLE</a> and many other commands all permit the user to
specify a database object either by its name alone, or by a combination of
its name and the name of its database. If no database is specified as part
of the object reference, then SQLite searches the main, temp and all attached
databases for an object with a matching name. The temp database is searched
first, followed by the main database, followed all attached databases in the
order that they were attached. The reference resolves to the first match
found. For example:
<pre>
/* Add a table named 't1' to the temp, main and an attached database */
ATTACH 'file.db' AS aux;
CREATE TABLE t1(x, y);
CREATE TEMP TABLE t1(x, y);
CREATE TABLE aux.t1(x, y);
DROP TABLE t1; /* Drop table in temp database */
DROP TABLE t1; /* Drop table in main database */
DROP TABLE t1; /* Drop table in aux database */
</pre>
<p>
If a database name is specified as part of an object reference, it must be
either "main", or "temp" or the name of an attached database. Like other
SQL identifiers, database names are case-insensitive. If a database name
is specified, then only the named database is searched for the named object.
<p>
Most object references may only resolve to a specific type of object (for
example a reference that is part of a DROP TABLE statement may only resolve
to a table object, not an index, trigger or view). However in some contexts
(e.g. <a href="lang_reindex.html">REINDEX</a>) an object reference may be resolve to more than one type
of object. When searching database schemas for a named object, objects of
types that cannot be used in the context of the reference are always
ignored.
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