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<a accesskey="1" href="page.php?w=SQL&amp;p=12">1.Previous</a><br />
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<p>implementations are incompatible between vendors and do not necessarily completely follow standards. In particular, date and time syntax, string concatenation, <code>NULL</code>s, and comparison <a href="page.php?w=case_sensitivity">case sensitivity</a> vary from vendor to vendor. <a href="page.php?w=PostgreSQL">PostgreSQL</a> and <a href="page.php?w=Mimer_SQL">Mimer SQL</a> strive for standards compliance, though PostgreSQL does not adhere to the standard in all cases. For example, the folding of unquoted names to lower case in PostgreSQL is</p><p>
<a accesskey="1" href="page.php?w=SQL&amp;p=12">1.Previous</a><br />
<a accesskey="3" href="page.php?w=SQL&amp;p=14">3.Next</a>
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