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Improve CHAR() description.

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Bruce Momjian 2003-01-12 05:16:12 +00:00
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@ -1,7 +1,7 @@
Frequently Asked Questions (FAQ) for PostgreSQL Frequently Asked Questions (FAQ) for PostgreSQL
Last updated: Tue Dec 17 23:56:27 EST 2002 Last updated: Sun Jan 12 00:16:01 EST 2003
Current maintainer: Bruce Momjian (pgman@candle.pha.pa.us) Current maintainer: Bruce Momjian (pgman@candle.pha.pa.us)
@ -834,13 +834,14 @@ BYTEA bytea variable-length byte array (null-byte safe)
space used is slightly greater than the declared size. However, these space used is slightly greater than the declared size. However, these
data types are also subject to compression or being stored out-of-line data types are also subject to compression or being stored out-of-line
by TOAST, so the space on disk might also be less than expected. by TOAST, so the space on disk might also be less than expected.
CHAR(n) is best when storing strings that are usually the same length.
VARCHAR(n) is best when storing variable-length strings but it limits VARCHAR(n) is best when storing variable-length strings but it limits
how long a string can be. TEXT is for strings of unlimited length, how long a string can be. TEXT is for strings of unlimited length,
maximum 1 gigabyte. BYTEA is for storing binary data, particularly maximum 1 gigabyte.
values that include NULL bytes. These types have similar performance
characteristics. CHAR(n) is for storing strings that are all the same length. CHAR(n)
stores trailing spaces, while VARCHAR(n) trims them. BYTEA is for
storing binary data, particularly values that include NULL bytes.
These types have similar performance characteristics.
4.15.1) How do I create a serial/auto-incrementing field? 4.15.1) How do I create a serial/auto-incrementing field?