diff options
Diffstat (limited to 'doc/src')
| -rw-r--r-- | doc/src/sgml/ref/alter_table.sgml | 20 |
1 files changed, 10 insertions, 10 deletions
diff --git a/doc/src/sgml/ref/alter_table.sgml b/doc/src/sgml/ref/alter_table.sgml index 5907a64a6b0..b5be516c52e 100644 --- a/doc/src/sgml/ref/alter_table.sgml +++ b/doc/src/sgml/ref/alter_table.sgml @@ -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> |