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22 Frequently Asked Questions (FAQ) for PostgreSQL
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4- Last updated: Sat Sep 22 20:07:41 EDT 2001
4+ Last updated: Fri Oct 12 21:32:36 EDT 2001
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66 Current maintainer: Bruce Momjian (pgman@candle.pha.pa.us)
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@@ -790,6 +790,12 @@ BYTEA bytea variable-length byte array (null-safe)
790790 data types are also subject to compression or being stored out-of-line
791791 by TOAST, so the space on disk might also be less than expected.
792792
793+ CHAR() is best when storing strings that are usually the same length.
794+ VARCHAR() is best when storing variable-length strings, but you want
795+ to limit how long a string can be. TEXT is for strings of unlimited
796+ length, maximum 1 gigabyte. BYTEA is for storing binary data,
797+ particularly values that include NULL bytes.
798+
793799 4.16.1) How do I create a serial/auto-incrementing field?
794800
795801 PostgreSQL supports a SERIAL data type. It auto-creates a sequence and
Original file line number Diff line number Diff line change 1212 alink ="#0000FF ">
1313 < H1 > Frequently Asked Questions (FAQ) for PostgreSQL</ H1 >
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15- < P > Last updated: Sat Sep 22 20:07:41 EDT 2001</ P >
15+ < P > Last updated: Fri Oct 12 21:32:36 EDT 2001</ P >
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1717 < P > Current maintainer: Bruce Momjian (< A href =
1818 "mailto:pgman@candle.pha.pa.us "> pgman@candle.pha.pa.us</ A > )< BR >
@@ -1003,6 +1003,12 @@ <H4><A name="4.15">4.15</A>) What is the difference between the
10031003 stored out-of-line by < SMALL > TOAST</ SMALL > , so the space on disk
10041004 might also be less than expected.</ P >
10051005
1006+ < P > CHAR() is best when storing strings that are usually the
1007+ same length. VARCHAR() is best when storing variable-length strings,
1008+ but you want to limit how long a string can be. TEXT is for strings
1009+ of unlimited length, maximum 1 gigabyte. BYTEA is for storing
1010+ binary data, particularly values that include NULL bytes.</ P >
1011+
10061012 < H4 > < A name ="4.16.1 "> 4.16.1</ A > ) How do I create a
10071013 serial/auto-incrementing field?</ H4 >
10081014
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