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diff --git a/doc/src/sgml/html/sql-alterforeigntable.html b/doc/src/sgml/html/sql-alterforeigntable.html new file mode 100644 index 0000000..f49de80 --- /dev/null +++ b/doc/src/sgml/html/sql-alterforeigntable.html @@ -0,0 +1,236 @@ +<?xml version="1.0" encoding="UTF-8" standalone="no"?> +<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /><title>ALTER FOREIGN TABLE</title><link rel="stylesheet" type="text/css" href="stylesheet.css" /><link rev="made" href="pgsql-docs@lists.postgresql.org" /><meta name="generator" content="DocBook XSL Stylesheets Vsnapshot" /><link rel="prev" href="sql-alterforeigndatawrapper.html" title="ALTER FOREIGN DATA WRAPPER" /><link rel="next" href="sql-alterfunction.html" title="ALTER FUNCTION" /></head><body id="docContent" class="container-fluid col-10"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="5" align="center">ALTER FOREIGN TABLE</th></tr><tr><td width="10%" align="left"><a accesskey="p" href="sql-alterforeigndatawrapper.html" title="ALTER FOREIGN DATA WRAPPER">Prev</a> </td><td width="10%" align="left"><a accesskey="u" href="sql-commands.html" title="SQL Commands">Up</a></td><th width="60%" align="center">SQL Commands</th><td width="10%" align="right"><a accesskey="h" href="index.html" title="PostgreSQL 15.5 Documentation">Home</a></td><td width="10%" align="right"> <a accesskey="n" href="sql-alterfunction.html" title="ALTER FUNCTION">Next</a></td></tr></table><hr /></div><div class="refentry" id="SQL-ALTERFOREIGNTABLE"><div class="titlepage"></div><a id="id-1.9.3.13.1" class="indexterm"></a><div class="refnamediv"><h2><span class="refentrytitle">ALTER FOREIGN TABLE</span></h2><p>ALTER FOREIGN TABLE — change the definition of a foreign table</p></div><div class="refsynopsisdiv"><h2>Synopsis</h2><pre class="synopsis"> +ALTER FOREIGN TABLE [ IF EXISTS ] [ ONLY ] <em class="replaceable"><code>name</code></em> [ * ] + <em class="replaceable"><code>action</code></em> [, ... ] +ALTER FOREIGN TABLE [ IF EXISTS ] [ ONLY ] <em class="replaceable"><code>name</code></em> [ * ] + RENAME [ COLUMN ] <em class="replaceable"><code>column_name</code></em> TO <em class="replaceable"><code>new_column_name</code></em> +ALTER FOREIGN TABLE [ IF EXISTS ] <em class="replaceable"><code>name</code></em> + RENAME TO <em class="replaceable"><code>new_name</code></em> +ALTER FOREIGN TABLE [ IF EXISTS ] <em class="replaceable"><code>name</code></em> + SET SCHEMA <em class="replaceable"><code>new_schema</code></em> + +<span class="phrase">where <em class="replaceable"><code>action</code></em> is one of:</span> + + ADD [ COLUMN ] <em class="replaceable"><code>column_name</code></em> <em class="replaceable"><code>data_type</code></em> [ COLLATE <em class="replaceable"><code>collation</code></em> ] [ <em class="replaceable"><code>column_constraint</code></em> [ ... ] ] + DROP [ COLUMN ] [ IF EXISTS ] <em class="replaceable"><code>column_name</code></em> [ RESTRICT | CASCADE ] + ALTER [ COLUMN ] <em class="replaceable"><code>column_name</code></em> [ SET DATA ] TYPE <em class="replaceable"><code>data_type</code></em> [ COLLATE <em class="replaceable"><code>collation</code></em> ] + ALTER [ COLUMN ] <em class="replaceable"><code>column_name</code></em> SET DEFAULT <em class="replaceable"><code>expression</code></em> + ALTER [ COLUMN ] <em class="replaceable"><code>column_name</code></em> DROP DEFAULT + ALTER [ COLUMN ] <em class="replaceable"><code>column_name</code></em> { SET | DROP } NOT NULL + ALTER [ COLUMN ] <em class="replaceable"><code>column_name</code></em> SET STATISTICS <em class="replaceable"><code>integer</code></em> + ALTER [ COLUMN ] <em class="replaceable"><code>column_name</code></em> SET ( <em class="replaceable"><code>attribute_option</code></em> = <em class="replaceable"><code>value</code></em> [, ... ] ) + ALTER [ COLUMN ] <em class="replaceable"><code>column_name</code></em> RESET ( <em class="replaceable"><code>attribute_option</code></em> [, ... ] ) + ALTER [ COLUMN ] <em class="replaceable"><code>column_name</code></em> SET STORAGE { PLAIN | EXTERNAL | EXTENDED | MAIN } + ALTER [ COLUMN ] <em class="replaceable"><code>column_name</code></em> OPTIONS ( [ ADD | SET | DROP ] <em class="replaceable"><code>option</code></em> ['<em class="replaceable"><code>value</code></em>'] [, ... ]) + ADD <em class="replaceable"><code>table_constraint</code></em> [ NOT VALID ] + VALIDATE CONSTRAINT <em class="replaceable"><code>constraint_name</code></em> + DROP CONSTRAINT [ IF EXISTS ] <em class="replaceable"><code>constraint_name</code></em> [ RESTRICT | CASCADE ] + DISABLE TRIGGER [ <em class="replaceable"><code>trigger_name</code></em> | ALL | USER ] + ENABLE TRIGGER [ <em class="replaceable"><code>trigger_name</code></em> | ALL | USER ] + ENABLE REPLICA TRIGGER <em class="replaceable"><code>trigger_name</code></em> + ENABLE ALWAYS TRIGGER <em class="replaceable"><code>trigger_name</code></em> + SET WITHOUT OIDS + INHERIT <em class="replaceable"><code>parent_table</code></em> + NO INHERIT <em class="replaceable"><code>parent_table</code></em> + OWNER TO { <em class="replaceable"><code>new_owner</code></em> | CURRENT_ROLE | CURRENT_USER | SESSION_USER } + OPTIONS ( [ ADD | SET | DROP ] <em class="replaceable"><code>option</code></em> ['<em class="replaceable"><code>value</code></em>'] [, ... ]) +</pre></div><div class="refsect1" id="id-1.9.3.13.5"><h2>Description</h2><p> + <code class="command">ALTER FOREIGN TABLE</code> changes the definition of an + existing foreign table. There are several subforms: + + </p><div class="variablelist"><dl class="variablelist"><dt><span class="term"><code class="literal">ADD COLUMN</code></span></dt><dd><p> + This form adds a new column to the foreign table, using the same syntax as + <a class="link" href="sql-createforeigntable.html" title="CREATE FOREIGN TABLE"><code class="command">CREATE FOREIGN TABLE</code></a>. + Unlike the case when adding a column to a regular table, nothing happens + to the underlying storage: this action simply declares that + some new column is now accessible through the foreign table. + </p></dd><dt><span class="term"><code class="literal">DROP COLUMN [ IF EXISTS ]</code></span></dt><dd><p> + This form drops a column from a foreign table. + You will need to say <code class="literal">CASCADE</code> if + anything outside the table depends on the column; for example, + views. + If <code class="literal">IF EXISTS</code> is specified and the column + does not exist, no error is thrown. In this case a notice + is issued instead. + </p></dd><dt><span class="term"><code class="literal">SET DATA TYPE</code></span></dt><dd><p> + This form changes the type of a column of a foreign table. + Again, this has no effect on any underlying storage: this action simply + changes the type that <span class="productname">PostgreSQL</span> believes the column to + have. + </p></dd><dt><span class="term"><code class="literal">SET</code>/<code class="literal">DROP DEFAULT</code></span></dt><dd><p> + These forms set or remove the default value for a column. + Default values only apply in subsequent <code class="command">INSERT</code> + or <code class="command">UPDATE</code> commands; they do not cause rows already in the + table to change. + </p></dd><dt><span class="term"><code class="literal">SET</code>/<code class="literal">DROP NOT NULL</code></span></dt><dd><p> + Mark a column as allowing, or not allowing, null values. + </p></dd><dt><span class="term"><code class="literal">SET STATISTICS</code></span></dt><dd><p> + This form + sets the per-column statistics-gathering target for subsequent + <a class="link" href="sql-analyze.html" title="ANALYZE"><code class="command">ANALYZE</code></a> operations. + See the similar form of <a class="link" href="sql-altertable.html" title="ALTER TABLE"><code class="command">ALTER TABLE</code></a> + for more details. + </p></dd><dt><span class="term"><code class="literal">SET ( <em class="replaceable"><code>attribute_option</code></em> = <em class="replaceable"><code>value</code></em> [, ... ] )</code><br /></span><span class="term"><code class="literal">RESET ( <em class="replaceable"><code>attribute_option</code></em> [, ... ] )</code></span></dt><dd><p> + This form sets or resets per-attribute options. + See the similar form of <a class="link" href="sql-altertable.html" title="ALTER TABLE"><code class="command">ALTER TABLE</code></a> + for more details. + </p></dd><dt><span class="term"> + <code class="literal">SET STORAGE</code> + </span></dt><dd><p> + This form sets the storage mode for a column. + See the similar form of <a class="link" href="sql-altertable.html" title="ALTER TABLE"><code class="command">ALTER TABLE</code></a> + for more details. + Note that the storage mode has no effect unless the table's + foreign-data wrapper chooses to pay attention to it. + </p></dd><dt><span class="term"><code class="literal">ADD <em class="replaceable"><code>table_constraint</code></em> [ NOT VALID ]</code></span></dt><dd><p> + This form adds a new constraint to a foreign table, using the same + syntax as <a class="link" href="sql-createforeigntable.html" title="CREATE FOREIGN TABLE"><code class="command">CREATE FOREIGN TABLE</code></a>. + Currently only <code class="literal">CHECK</code> constraints are supported. + </p><p> + Unlike the case when adding a constraint to a regular table, nothing is + done to verify the constraint is correct; rather, this action simply + declares that some new condition should be assumed to hold for all rows + in the foreign table. (See the discussion + in <a class="link" href="sql-createforeigntable.html" title="CREATE FOREIGN TABLE"><code class="command">CREATE FOREIGN TABLE</code></a>.) + If the constraint is marked <code class="literal">NOT VALID</code>, then it isn't + assumed to hold, but is only recorded for possible future use. + </p></dd><dt><span class="term"><code class="literal">VALIDATE CONSTRAINT</code></span></dt><dd><p> + This form marks as valid a constraint that was previously marked + as <code class="literal">NOT VALID</code>. No action is taken to verify the + constraint, but future queries will assume that it holds. + </p></dd><dt><span class="term"><code class="literal">DROP CONSTRAINT [ IF EXISTS ]</code></span></dt><dd><p> + This form drops the specified constraint on a foreign table. + If <code class="literal">IF EXISTS</code> is specified and the constraint + does not exist, no error is thrown. + In this case a notice is issued instead. + </p></dd><dt><span class="term"><code class="literal">DISABLE</code>/<code class="literal">ENABLE [ REPLICA | ALWAYS ] TRIGGER</code></span></dt><dd><p> + These forms configure the firing of trigger(s) belonging to the foreign + table. See the similar form of <a class="link" href="sql-altertable.html" title="ALTER TABLE"><code class="command">ALTER TABLE</code></a> for more + details. + </p></dd><dt><span class="term"><code class="literal">SET WITHOUT OIDS</code></span></dt><dd><p> + Backward compatibility syntax for removing the <code class="literal">oid</code> + system column. As <code class="literal">oid</code> system columns cannot be added + anymore, this never has an effect. + </p></dd><dt><span class="term"><code class="literal">INHERIT <em class="replaceable"><code>parent_table</code></em></code></span></dt><dd><p> + This form adds the target foreign table as a new child of the specified + parent table. + See the similar form of <a class="link" href="sql-altertable.html" title="ALTER TABLE"><code class="command">ALTER TABLE</code></a> + for more details. + </p></dd><dt><span class="term"><code class="literal">NO INHERIT <em class="replaceable"><code>parent_table</code></em></code></span></dt><dd><p> + This form removes the target foreign table from the list of children of + the specified parent table. + </p></dd><dt><span class="term"><code class="literal">OWNER</code></span></dt><dd><p> + This form changes the owner of the foreign table to the + specified user. + </p></dd><dt><span class="term"><code class="literal">OPTIONS ( [ ADD | SET | DROP ] <em class="replaceable"><code>option</code></em> ['<em class="replaceable"><code>value</code></em>'] [, ... ] )</code></span></dt><dd><p> + Change options for the foreign table or one of its columns. + <code class="literal">ADD</code>, <code class="literal">SET</code>, and <code class="literal">DROP</code> + specify the action to be performed. <code class="literal">ADD</code> is assumed + if no operation is explicitly specified. Duplicate option names are not + allowed (although it's OK for a table option and a column option to have + the same name). Option names and values are also validated using the + foreign data wrapper library. + </p></dd><dt><span class="term"><code class="literal">RENAME</code></span></dt><dd><p> + The <code class="literal">RENAME</code> forms change the name of a foreign table + or the name of an individual column in a foreign table. + </p></dd><dt><span class="term"><code class="literal">SET SCHEMA</code></span></dt><dd><p> + This form moves the foreign table into another schema. + </p></dd></dl></div><p> + </p><p> + All the actions except <code class="literal">RENAME</code> and <code class="literal">SET SCHEMA</code> + can be combined into + a list of multiple alterations to apply in parallel. For example, it + is possible to add several columns and/or alter the type of several + columns in a single command. + </p><p> + If the command is written as <code class="literal">ALTER FOREIGN TABLE IF EXISTS ...</code> + and the foreign table does not exist, no error is thrown. A notice is + issued in this case. + </p><p> + You must own the table to use <code class="command">ALTER FOREIGN TABLE</code>. + To change the schema of a foreign table, you must also have + <code class="literal">CREATE</code> privilege on the new schema. + To alter the owner, you must also be a direct or indirect member of the new + owning role, and that role must have <code class="literal">CREATE</code> privilege on + the table's schema. (These restrictions enforce that altering the owner + doesn't do anything you couldn't do by dropping and recreating the table. + However, a superuser can alter ownership of any table anyway.) + To add a column or alter a column type, you must also + have <code class="literal">USAGE</code> privilege on the data type. + </p></div><div class="refsect1" id="id-1.9.3.13.6"><h2>Parameters</h2><div class="variablelist"><dl class="variablelist"><dt><span class="term"><em class="replaceable"><code>name</code></em></span></dt><dd><p> + The name (possibly schema-qualified) of an existing foreign table to + alter. If <code class="literal">ONLY</code> is specified before the table name, only + that table is altered. If <code class="literal">ONLY</code> is not specified, the table + and all its descendant tables (if any) are altered. Optionally, + <code class="literal">*</code> can be specified after the table name to explicitly + indicate that descendant tables are included. + </p></dd><dt><span class="term"><em class="replaceable"><code>column_name</code></em></span></dt><dd><p> + Name of a new or existing column. + </p></dd><dt><span class="term"><em class="replaceable"><code>new_column_name</code></em></span></dt><dd><p> + New name for an existing column. + </p></dd><dt><span class="term"><em class="replaceable"><code>new_name</code></em></span></dt><dd><p> + New name for the table. + </p></dd><dt><span class="term"><em class="replaceable"><code>data_type</code></em></span></dt><dd><p> + Data type of the new column, or new data type for an existing + column. + </p></dd><dt><span class="term"><em class="replaceable"><code>table_constraint</code></em></span></dt><dd><p> + New table constraint for the foreign table. + </p></dd><dt><span class="term"><em class="replaceable"><code>constraint_name</code></em></span></dt><dd><p> + Name of an existing constraint to drop. + </p></dd><dt><span class="term"><code class="literal">CASCADE</code></span></dt><dd><p> + Automatically drop objects that depend on the dropped column + or constraint (for example, views referencing the column), + and in turn all objects that depend on those objects + (see <a class="xref" href="ddl-depend.html" title="5.14. Dependency Tracking">Section 5.14</a>). + </p></dd><dt><span class="term"><code class="literal">RESTRICT</code></span></dt><dd><p> + Refuse to drop the column or constraint if there are any dependent + objects. This is the default behavior. + </p></dd><dt><span class="term"><em class="replaceable"><code>trigger_name</code></em></span></dt><dd><p> + Name of a single trigger to disable or enable. + </p></dd><dt><span class="term"><code class="literal">ALL</code></span></dt><dd><p> + Disable or enable all triggers belonging to the foreign table. (This + requires superuser privilege if any of the triggers are internally + generated triggers. The core system does not add such triggers to + foreign tables, but add-on code could do so.) + </p></dd><dt><span class="term"><code class="literal">USER</code></span></dt><dd><p> + Disable or enable all triggers belonging to the foreign table except + for internally generated triggers. + </p></dd><dt><span class="term"><em class="replaceable"><code>parent_table</code></em></span></dt><dd><p> + A parent table to associate or de-associate with this foreign table. + </p></dd><dt><span class="term"><em class="replaceable"><code>new_owner</code></em></span></dt><dd><p> + The user name of the new owner of the table. + </p></dd><dt><span class="term"><em class="replaceable"><code>new_schema</code></em></span></dt><dd><p> + The name of the schema to which the table will be moved. + </p></dd></dl></div></div><div class="refsect1" id="id-1.9.3.13.7"><h2>Notes</h2><p> + The key word <code class="literal">COLUMN</code> is noise and can be omitted. + </p><p> + Consistency with the foreign server is not checked when a column is added + or removed with <code class="literal">ADD COLUMN</code> or + <code class="literal">DROP COLUMN</code>, a <code class="literal">NOT NULL</code> + or <code class="literal">CHECK</code> constraint is added, or a column type is changed + with <code class="literal">SET DATA TYPE</code>. It is the user's responsibility to ensure + that the table definition matches the remote side. + </p><p> + Refer to <a class="link" href="sql-createforeigntable.html" title="CREATE FOREIGN TABLE"><code class="command">CREATE FOREIGN TABLE</code></a> for a further description of valid + parameters. + </p></div><div class="refsect1" id="id-1.9.3.13.8"><h2>Examples</h2><p> + To mark a column as not-null: +</p><pre class="programlisting"> +ALTER FOREIGN TABLE distributors ALTER COLUMN street SET NOT NULL; +</pre><p> + </p><p> + To change options of a foreign table: +</p><pre class="programlisting"> +ALTER FOREIGN TABLE myschema.distributors OPTIONS (ADD opt1 'value', SET opt2 'value2', DROP opt3); +</pre></div><div class="refsect1" id="id-1.9.3.13.9"><h2>Compatibility</h2><p> + The forms <code class="literal">ADD</code>, <code class="literal">DROP</code>, + and <code class="literal">SET DATA TYPE</code> + conform with the SQL standard. The other forms are + <span class="productname">PostgreSQL</span> extensions of the SQL standard. + Also, the ability to specify more than one manipulation in a single + <code class="command">ALTER FOREIGN TABLE</code> command is an extension. + </p><p> + <code class="command">ALTER FOREIGN TABLE DROP COLUMN</code> can be used to drop the only + column of a foreign table, leaving a zero-column table. This is an + extension of SQL, which disallows zero-column foreign tables. + </p></div><div class="refsect1" id="id-1.9.3.13.10"><h2>See Also</h2><span class="simplelist"><a class="xref" href="sql-createforeigntable.html" title="CREATE FOREIGN TABLE"><span class="refentrytitle">CREATE FOREIGN TABLE</span></a>, <a class="xref" href="sql-dropforeigntable.html" title="DROP FOREIGN TABLE"><span class="refentrytitle">DROP FOREIGN TABLE</span></a></span></div></div><div class="navfooter"><hr /><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="sql-alterforeigndatawrapper.html" title="ALTER FOREIGN DATA WRAPPER">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="sql-commands.html" title="SQL Commands">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="sql-alterfunction.html" title="ALTER FUNCTION">Next</a></td></tr><tr><td width="40%" align="left" valign="top">ALTER FOREIGN DATA WRAPPER </td><td width="20%" align="center"><a accesskey="h" href="index.html" title="PostgreSQL 15.5 Documentation">Home</a></td><td width="40%" align="right" valign="top"> ALTER FUNCTION</td></tr></table></div></body></html>
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