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<h1 class="heading">
SQL As Understood By SQLite</h1>
<h4>
ATTACH DATABASE</h4>
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<i><font color="#ff3434">sql-statement</font></i> ::=</td>
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<b><font color="#2c2cf0">ATTACH </font></b>[<b><font color="#2c2cf0">DATABASE</font></b>]<b><font
color="#2c2cf0"> </font></b><i><font color="#ff3434">database-filename</font></i><b><font
color="#2c2cf0"> AS </font></b><i><font color="#ff3434">database-name</font></i><b><font
color="#2c2cf0"></font></b></td>
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<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
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 DATABASE</a> statement.</p>
<p>
You can read from and write to an attached database and you can modify the schema
of the attached database. This is a new feature of SQLite version 3.0. In SQLite
2.8, schema changes to attached databases were not allowed.</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
doesn't require a database name 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 table 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 ":memory:". 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 COMMIT where two or more database files are updated,
some of those files might get the changes where others might not. Atomic commit
of attached databases is a new feature of SQLite version 3.0. In SQLite version
2.8, all commits to attached databases behaved as if the main database were ":memory:".
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There is a compile-time limit of 10 attached database files.</p>
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