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<title>SQL Features That SQLite Does Not Implement</title>
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<h2>SQL Features That SQLite Does Not Implement</h2>
<p>
Rather than try to list all the features of SQL92 that SQLite does
support, it is much easier to list those that it does not.
Unsupported features of SQL92 are shown below.</p>
<p>
The order of this list gives some hint as to when a feature might
be added to SQLite. Those features near the top of the list are
likely to be added in the near future. There are no immediate
plans to add features near the bottom of the list.
</p>
<table cellpadding="10">
<tr><td valign="top"><b><nobr>RIGHT and FULL OUTER JOIN</nobr></b></td><td width="10"> </th><td valign="top">
LEFT OUTER JOIN is implemented, but not RIGHT OUTER JOIN or
FULL OUTER JOIN.
</td></tr><tr><td valign="top"><b><nobr>Complete ALTER TABLE support</nobr></b></td><td width="10"> </th><td valign="top">
Only the RENAME TABLE and ADD COLUMN variants of the
ALTER TABLE command are supported. Other kinds of ALTER TABLE operations
such as
DROP COLUMN, ALTER COLUMN, ADD CONSTRAINT, and so forth are omitted.
</td></tr><tr><td valign="top"><b><nobr>Complete trigger support</nobr></b></td><td width="10"> </th><td valign="top">
FOR EACH ROW triggers are supported but not FOR EACH STATEMENT
triggers.
</td></tr><tr><td valign="top"><b><nobr>Writing to VIEWs</nobr></b></td><td width="10"> </th><td valign="top">
VIEWs in SQLite are read-only. You may not execute a DELETE, INSERT, or
UPDATE statement on a view. But you can create a trigger
that fires on an attempt to DELETE, INSERT, or UPDATE a view and do
what you need in the body of the trigger.
</td></tr><tr><td valign="top"><b><nobr>GRANT and REVOKE</nobr></b></td><td width="10"> </th><td valign="top">
Since SQLite reads and writes an ordinary disk file, the
only access permissions that can be applied are the normal
file access permissions of the underlying operating system.
The GRANT and REVOKE commands commonly found on client/server
RDBMSes are not implemented because they would be meaningless
for an embedded database engine.
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