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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 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 adds a new constraint to the table using the same syntax as <xref
linkend="SQL-CREATETABLE">. linkend="SQL-CREATETABLE">.
The DROP CONSTRAINT <replaceable class="PARAMETER">constraint</replaceable> clause 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"> The OWNER clause changes the owner of the table to the user <replaceable class="PARAMETER">
new user</replaceable>. new user</replaceable>.
</para> </para>
@ -207,15 +207,15 @@ ALTER TABLE <replaceable class="PARAMETER">table</replaceable>
new default value, using <xref linkend="sql-update">.) new default value, using <xref linkend="sql-update">.)
</para> </para>
<para> <para>
Currently only CHECK constraints can be dropped from a table. The RESTRICT In DROP CONSTRAINT, the RESTRICT keyword is required, although
keyword is required, although dependencies are not checked. The CASCADE dependencies are not yet checked. The CASCADE option is unsupported.
option is unsupported. To remove a PRIMARY or UNIQUE constraint, drop the Currently DROP CONSTRAINT drops only CHECK constraints.
relevant index using the <xref linkend="SQL-DROPINDEX"> command. 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 To remove FOREIGN KEY constraints you need to recreate
and reload the table, using other parameters to the and reload the table, using other parameters to the
<xref linkend="SQL-CREATETABLE"> <xref linkend="SQL-CREATETABLE"> command.
command.
</para> </para>
<para> <para>
For example, to drop all constraints on a table <literal>distributors</literal>: 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> <para>
To remove a check constraint from a table and all its children: To remove a check constraint from a table and all its children:
<programlisting> <programlisting>
ALTER TABLE distributors DROP CONSTRAINT zipchk; ALTER TABLE distributors DROP CONSTRAINT zipchk RESTRICT;
</programlisting> </programlisting>
</para> </para>