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<title>Differences for Users of other SQL Engines</title>
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<th colspan="3" align="center">Differences for Users of other SQL Engines</th>
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<td width="20%" align="left"><a accesskey="p" href="sequencesupport.html">Prev</a> </td>
<th width="60%" align="center">Chapter 1. Berkeley DB SQL: The Absolute Basics</th>
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<h2 class="title" style="clear: both"><a id="normal-sql"></a>Differences for Users of other SQL Engines</h2>
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<p>
If you are used to a SQL implementation from other SQL
engine (such as Oracle's RDBMS), the SQL used by the BDB SQL interface
(which is the same as used by SQLite) may hold some surprises for
you.
</p>
<p>
Some things in particular to take note of:
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<div class="itemizedlist">
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<p>
Datatyping is weaker in SQLite than it is with
standard SQL. For example, SQLite does not
enforce the length of a <code class="literal">VARCHAR</code>.
While standard SQL will truncate a
<code class="literal">VARCHAR</code> that is too long, you
could (for example) declare a
<code class="literal">VARCHAR(10)</code> then put 500
characters in it without any truncation, ever.
</p>
<p>
SQLite datatyping is described in detail on the
<a class="ulink" href="http://sqlite.org/datatype3.html" target="_top">
Datatypes in SQLite Version 3
</a> page.
</p>
</li>
<li>
<p>
Do not use autocommit with SQLite. Instead, use
<code class="literal">begin exclusive</code>
and then <code class="literal">commit</code>.
</p>
</li>
<li>
<p>
How NULLs are handled in SQLite may be different from what
you are used to. See
<a class="ulink" href="http://www.sqlite.org/nulls.html" target="_top">
NULL Handling in SQLite Versus Other Database Engines
</a>
for details.
</p>
</li>
<li>
<p>
There are some features of SQL that SQLite does
not support. For more information, see
<a class="ulink" href="http://www.sqlite.org/omitted.html" target="_top">
SQL Features That SQLite Does Not Implement.
</a>
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<td width="40%" align="left" valign="top">Using Sequences </td>
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