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体验新版 GitCode,发现更多精彩内容 >>
提交
3debf968
编写于
2月 25, 2005
作者:
B
Bruce Momjian
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电子邮件补丁
差异文件
Fix markup.
上级
026a8510
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2
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doc/FAQ
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doc/src/FAQ/FAQ.html
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doc/FAQ
浏览文件 @
3debf968
Frequently Asked Questions (FAQ) for PostgreSQL
Last updated: Thu Feb 24 19:3
2:04
EST 2005
Last updated: Thu Feb 24 19:3
3:07
EST 2005
Current maintainer: Bruce Momjian (pgman@candle.pha.pa.us)
...
...
@@ -645,10 +645,10 @@
FROM tab
WHERE col IS NULL;
To sort by the NULL
IS NULL
and IS NOT NULL modifiers in your WHERE clause. Things that are true
will sort higher than things that are false, so the following will put
NULL entries at the
top of the resulting list:
To sort by the NULL
status, use the IS NULL and IS NOT NULL modifiers
in your WHERE clause. Things that are true will sort higher than
things that are false, so the following will put NULL entries at the
top of the resulting list:
SELECT *
FROM tab
ORDER BY (col IS NOT NULL)
...
...
doc/src/FAQ/FAQ.html
浏览文件 @
3debf968
...
...
@@ -10,7 +10,7 @@
alink=
"#0000ff"
>
<H1>
Frequently Asked Questions (FAQ) for PostgreSQL
</H1>
<P>
Last updated: Thu Feb 24 19:3
2:04
EST 2005
</P>
<P>
Last updated: Thu Feb 24 19:3
3:07
EST 2005
</P>
<P>
Current maintainer: Bruce Momjian (
<A
href=
"mailto:pgman@candle.pha.pa.us"
>
pgman@candle.pha.pa.us
</A>
)
...
...
@@ -828,7 +828,7 @@ table?</TD><TD>unlimited</TD></TR>
WHERE col IS NULL;
</PRE>
<P>
To sort by the
<SMALL>
NULL
</SMALL
status,
use
the
<SMALL
>
IS NULL
</SMALL>
<P>
To sort by the
<SMALL>
NULL
</SMALL
>
status, use the
<SMALL>
IS NULL
</SMALL>
and
<SMALL>
IS NOT NULL
</SMALL>
modifiers in your
<SMALL>
WHERE
</SMALL>
clause.
Things that are
<I>
true
</I>
will sort higher than things that are
<I>
false
</I>
,
so the following will put NULL entries at the top of the resulting list:
</P>
...
...
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