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| author | Bruce Momjian <bruce@momjian.us> | 2002-09-02 06:20:53 +0000 |
|---|---|---|
| committer | Bruce Momjian <bruce@momjian.us> | 2002-09-02 06:20:53 +0000 |
| commit | 81efc826081b7889753c449cf29dd72f75690047 (patch) | |
| tree | c8d8f6acab955099f9b7d9b3d107b08ae0404151 /doc/src | |
| parent | f1c1685b391e76c3784c8809eeb5c47df04016c0 (diff) | |
| download | postgresql-81efc826081b7889753c449cf29dd72f75690047.tar.gz postgresql-81efc826081b7889753c449cf29dd72f75690047.zip | |
This patch fixes a minor inaccuracy in the documentation: NOT NULL is
not synonymous with CHECK (xxx IS NOT NULL) -- for example, consider
ALTER TABLE ADD PRIMARY KEY, which checks for 'NOT NULL', not a check
constraint.
Neil Conway
Diffstat (limited to 'doc/src')
| -rw-r--r-- | doc/src/sgml/ref/create_table.sgml | 6 |
1 files changed, 2 insertions, 4 deletions
diff --git a/doc/src/sgml/ref/create_table.sgml b/doc/src/sgml/ref/create_table.sgml index 5ef7a5d6e70..9e9525775c7 100644 --- a/doc/src/sgml/ref/create_table.sgml +++ b/doc/src/sgml/ref/create_table.sgml @@ -1,5 +1,5 @@ <!-- -$Header: /cvsroot/pgsql/doc/src/sgml/ref/create_table.sgml,v 1.55 2002/05/18 15:44:47 petere Exp $ +$Header: /cvsroot/pgsql/doc/src/sgml/ref/create_table.sgml,v 1.56 2002/09/02 06:20:53 momjian Exp $ PostgreSQL documentation --> @@ -247,9 +247,7 @@ and <replaceable class="PARAMETER">table_constraint</replaceable> is: <term><literal>NOT NULL</></term> <listitem> <para> - The column is not allowed to contain NULL values. This is - equivalent to the column constraint <literal>CHECK (<replaceable - class="PARAMETER">column</replaceable> NOT NULL)</literal>. + The column is not allowed to contain NULL values. </para> </listitem> </varlistentry> |