提交 6f485584 编写于 作者: B Bruce Momjian

Update CHAR() description.

上级 d340e006
Frequently Asked Questions (FAQ) for PostgreSQL Frequently Asked Questions (FAQ) for PostgreSQL
Last updated: Sun Jan 12 00:16:01 EST 2003 Last updated: Sun Jan 12 09:58:38 EST 2003
Current maintainer: Bruce Momjian (pgman@candle.pha.pa.us) Current maintainer: Bruce Momjian (pgman@candle.pha.pa.us)
...@@ -839,9 +839,10 @@ BYTEA bytea variable-length byte array (null-byte safe) ...@@ -839,9 +839,10 @@ BYTEA bytea variable-length byte array (null-byte safe)
maximum 1 gigabyte. maximum 1 gigabyte.
CHAR(n) is for storing strings that are all the same length. CHAR(n) 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 pads with blanks to the specified length, while VARCHAR(n) only stores
storing binary data, particularly values that include NULL bytes. the characters supplied. BYTEA is for storing binary data,
These types have similar performance characteristics. 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?
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