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体验新版 GitCode,发现更多精彩内容 >>
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657d0044
编写于
10月 13, 2001
作者:
B
Bruce Momjian
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doc/FAQ
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657d0044
Frequently Asked Questions (FAQ) for PostgreSQL
Last updated:
Fri Oct 12 23:53:3
5 EDT 2001
Last updated:
Sat Oct 13 01:26:5
5 EDT 2001
Current maintainer: Bruce Momjian (pgman@candle.pha.pa.us)
...
...
@@ -791,10 +791,10 @@ BYTEA bytea variable-length byte array (null-safe)
by TOAST, so the space on disk might also be less than expected.
CHAR() is best when storing strings that are usually the same length.
VARCHAR() is best when storing variable-length strings
, but you want
to limit how long a string can be. TEXT is for strings of unlimited
length, maximum 1 gigabyte. BYTEA is for storing binary data,
particularly
values that include NULL bytes.
VARCHAR() is best when storing variable-length strings
but it limits
how long a string can be. TEXT is for strings of unlimited length,
maximum 1 gigabyte. BYTEA is for storing binary data, particularly
values that include NULL bytes.
4.16.1) How do I create a serial/auto-incrementing field?
...
...
doc/src/FAQ/FAQ.html
浏览文件 @
657d0044
...
...
@@ -12,7 +12,7 @@
alink=
"#0000FF"
>
<H1>
Frequently Asked Questions (FAQ) for PostgreSQL
</H1>
<P>
Last updated:
Fri Oct 12 23:53:3
5 EDT 2001
</P>
<P>
Last updated:
Sat Oct 13 01:26:5
5 EDT 2001
</P>
<P>
Current maintainer: Bruce Momjian (
<A
href=
"mailto:pgman@candle.pha.pa.us"
>
pgman@candle.pha.pa.us
</A>
)
<BR>
...
...
@@ -1003,11 +1003,13 @@ BYTEA bytea variable-length byte array (null-safe)
stored out-of-line by
<SMALL>
TOAST
</SMALL>
, so the space on disk
might also be less than expected.
</P>
<P>
CHAR() is best when storing strings that are usually the
same length. VARCHAR() is best when storing variable-length strings,
but you want to limit how long a string can be. TEXT is for strings
of unlimited length, maximum 1 gigabyte. BYTEA is for storing
binary data, particularly values that include NULL bytes.
</P>
<P><SMALL>
CHAR()
</SMALL>
is best when storing strings that are
usually the same length.
<SMALL>
VARCHAR()
</SMALL>
is best when
storing variable-length strings but it limits how long a
string can be.
<SMALL>
TEXT
</SMALL>
is for strings of unlimited
length, maximum 1 gigabyte.
<SMALL>
BYTEA
</SMALL>
is for storing
binary data, particularly values that include
<SMALL>
NULL
</SMALL>
bytes.
</P>
<H4><A
name=
"4.16.1"
>
4.16.1
</A>
) How do I create a
serial/auto-incrementing field?
</H4>
...
...
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