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Fix markup.
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doc/FAQ
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doc/FAQ
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Frequently Asked Questions (FAQ) for PostgreSQL
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Frequently Asked Questions (FAQ) for PostgreSQL
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Last updated: Thu Feb 24 19:32:04 EST 2005
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Last updated: Thu Feb 24 19:33:07 EST 2005
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Current maintainer: Bruce Momjian (pgman@candle.pha.pa.us)
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Current maintainer: Bruce Momjian (pgman@candle.pha.pa.us)
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FROM tab
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FROM tab
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WHERE col IS NULL;
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WHERE col IS NULL;
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To sort by the NULLIS NULL
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To sort by the NULL status, use the IS NULL and IS NOT NULL modifiers
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and IS NOT NULL modifiers in your WHERE clause. Things that are true
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in your WHERE clause. Things that are true will sort higher than
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will sort higher than things that are false, so the following will put
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things that are false, so the following will put NULL entries at the
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NULL entries at the top of the resulting list:
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top of the resulting list:
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SELECT *
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SELECT *
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FROM tab
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FROM tab
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ORDER BY (col IS NOT NULL)
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ORDER BY (col IS NOT NULL)
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@ -10,7 +10,7 @@
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alink="#0000ff">
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alink="#0000ff">
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<H1>Frequently Asked Questions (FAQ) for PostgreSQL</H1>
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<H1>Frequently Asked Questions (FAQ) for PostgreSQL</H1>
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<P>Last updated: Thu Feb 24 19:32:04 EST 2005</P>
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<P>Last updated: Thu Feb 24 19:33:07 EST 2005</P>
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<P>Current maintainer: Bruce Momjian (<A href=
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<P>Current maintainer: Bruce Momjian (<A href=
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"mailto:pgman@candle.pha.pa.us">pgman@candle.pha.pa.us</A>)
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"mailto:pgman@candle.pha.pa.us">pgman@candle.pha.pa.us</A>)
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@ -828,7 +828,7 @@ table?</TD><TD>unlimited</TD></TR>
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WHERE col IS NULL;
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WHERE col IS NULL;
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</PRE>
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</PRE>
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<P>To sort by the <SMALL>NULL</SMALL status, use the <SMALL>IS NULL</SMALL>
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<P>To sort by the <SMALL>NULL</SMALL> status, use the <SMALL>IS NULL</SMALL>
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and <SMALL>IS NOT NULL</SMALL> modifiers in your <SMALL>WHERE</SMALL> clause.
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and <SMALL>IS NOT NULL</SMALL> modifiers in your <SMALL>WHERE</SMALL> clause.
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Things that are <I>true</I> will sort higher than things that are <I>false</I>,
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Things that are <I>true</I> will sort higher than things that are <I>false</I>,
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so the following will put NULL entries at the top of the resulting list:</P>
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so the following will put NULL entries at the top of the resulting list:</P>
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