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Repair erroneous ALTER DROP CONSTRAINT example.

This commit is contained in:
Tom Lane 2001-11-10 20:13:37 +00:00
parent be4e5059a2
commit 26e8a4f356
1 changed files with 10 additions and 10 deletions
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20
doc/src/sgml/ref/alter_table.sgml
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@ -1,5 +1,5 @@
<!--
$Header: /cvsroot/pgsql/doc/src/sgml/ref/alter_table.sgml,v 1.30 2001/10/22 18:14:47 petere Exp $
$Header: /cvsroot/pgsql/doc/src/sgml/ref/alter_table.sgml,v 1.31 2001/11/10 20:13:37 tgl Exp $
Postgres documentation
-->
@ -178,7 +178,7 @@ ALTER TABLE <replaceable class="PARAMETER">table</replaceable>
adds a new constraint to the table using the same syntax as <xref
linkend="SQL-CREATETABLE">.
The DROP CONSTRAINT <replaceable class="PARAMETER">constraint</replaceable> clause
drops all CHECK constraints on the table (and its children) that match <replaceable class="PARAMETER">constraint</replaceable>.
drops all constraints on the table (and its children) that match <replaceable class="PARAMETER">constraint</replaceable>.
The OWNER clause changes the owner of the table to the user <replaceable class="PARAMETER">
new user</replaceable>.
</para>
@ -207,15 +207,15 @@ ALTER TABLE <replaceable class="PARAMETER">table</replaceable>
new default value, using <xref linkend="sql-update">.)
</para>
<para>
Currently only CHECK constraints can be dropped from a table. The RESTRICT
keyword is required, although dependencies are not checked. The CASCADE
option is unsupported. To remove a PRIMARY or UNIQUE constraint, drop the
relevant index using the <xref linkend="SQL-DROPINDEX"> command.
<para>
In DROP CONSTRAINT, the RESTRICT keyword is required, although
dependencies are not yet checked. The CASCADE option is unsupported.
Currently DROP CONSTRAINT drops only CHECK constraints.
To remove a PRIMARY or UNIQUE constraint, drop the
relevant index using the <xref linkend="SQL-DROPINDEX"> command.
To remove FOREIGN KEY constraints you need to recreate
and reload the table, using other parameters to the
<xref linkend="SQL-CREATETABLE">
command.
<xref linkend="SQL-CREATETABLE"> command.
</para>
<para>
For example, to drop all constraints on a table <literal>distributors</literal>:
@ -277,7 +277,7 @@ ALTER TABLE distributors ADD CONSTRAINT zipchk CHECK (char_length(zipcode) = 5);
<para>
To remove a check constraint from a table and all its children:
<programlisting>
ALTER TABLE distributors DROP CONSTRAINT zipchk;
ALTER TABLE distributors DROP CONSTRAINT zipchk RESTRICT;
</programlisting>
</para>