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<title>SQLite Query Language: ATTACH DATABASE</title>
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<a href="lang.html">
           <h2 align="center">SQL As Understood By SQLite</h2></a><h1>ATTACH DATABASE</h1><h4><a href="syntaxdiagrams.html#attach-stmt">attach-stmt:</a></h4><blockquote> <img alt="syntax diagram attach-stmt" src="images/syntax/attach-stmt.gif"></img> </blockquote>


<p>The ATTACH DATABASE statement adds another database 
file to the current database connection.  If the filename contains 
punctuation characters it must be quoted.  The database-names 'main' and 
'temp' refer to the main database and the database used for 
temporary tables.  These cannot be detached.  Attached databases 
are removed using the <a href="lang_detach.html">DETACH</a> statement.</p>

<p>You cannot create a new table with the same name as a table in 
an attached database, but you can attach a database which contains
tables whose names are duplicates of tables in the main database.  It is 
also permissible to attach the same database file multiple times.</p>

<p>Tables in an attached database can be referred to using the syntax 
<i>database-name.table-name</i>.  If an attached table doesn't have 
a duplicate table name in the main database, it does not require a 
<i>database-name</i> prefix.  When a database is attached, all of its 
tables which don't have duplicate names become the default table
of that name.  Any tables of that name attached afterwards require the
database prefix. If the default table of a given name is detached, then
the last table of that name attached becomes the new default.</p>

<p>
Transactions involving multiple attached databases are atomic,
assuming that the main database is not "<a href="inmemorydb.html">:memory:</a>".  If the main
database is ":memory:" then 
transactions continue to be atomic within each individual
database file. But if the host computer crashes in the middle
of a <a href="lang_transaction.html">COMMIT</a> where two or more database files are updated,
some of those files might get the changes where others
might not.
</p>

<p>There is a compile-time limit of SQLITE_MAX_ATTACHED
attached database files.</p>