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diff --git a/doc/src/sgml/html/sql-createschema.html b/doc/src/sgml/html/sql-createschema.html new file mode 100644 index 0000000..8362fa3 --- /dev/null +++ b/doc/src/sgml/html/sql-createschema.html @@ -0,0 +1,117 @@ +<?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>CREATE SCHEMA</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 V1.79.1" /><link rel="prev" href="sql-createrule.html" title="CREATE RULE" /><link rel="next" href="sql-createsequence.html" title="CREATE SEQUENCE" /></head><body id="docContent" class="container-fluid col-10"><div xmlns="http://www.w3.org/TR/xhtml1/transitional" class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="5" align="center">CREATE SCHEMA</th></tr><tr><td width="10%" align="left"><a accesskey="p" href="sql-createrule.html" title="CREATE RULE">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 13.4 Documentation">Home</a></td><td width="10%" align="right"> <a accesskey="n" href="sql-createsequence.html" title="CREATE SEQUENCE">Next</a></td></tr></table><hr></hr></div><div class="refentry" id="SQL-CREATESCHEMA"><div class="titlepage"></div><a id="id-1.9.3.80.1" class="indexterm"></a><div class="refnamediv"><h2><span class="refentrytitle">CREATE SCHEMA</span></h2><p>CREATE SCHEMA — define a new schema</p></div><div class="refsynopsisdiv"><h2>Synopsis</h2><pre class="synopsis"> +CREATE SCHEMA <em class="replaceable"><code>schema_name</code></em> [ AUTHORIZATION <em class="replaceable"><code>role_specification</code></em> ] [ <em class="replaceable"><code>schema_element</code></em> [ ... ] ] +CREATE SCHEMA AUTHORIZATION <em class="replaceable"><code>role_specification</code></em> [ <em class="replaceable"><code>schema_element</code></em> [ ... ] ] +CREATE SCHEMA IF NOT EXISTS <em class="replaceable"><code>schema_name</code></em> [ AUTHORIZATION <em class="replaceable"><code>role_specification</code></em> ] +CREATE SCHEMA IF NOT EXISTS AUTHORIZATION <em class="replaceable"><code>role_specification</code></em> + +<span class="phrase">where <em class="replaceable"><code>role_specification</code></em> can be:</span> + + <em class="replaceable"><code>user_name</code></em> + | CURRENT_USER + | SESSION_USER +</pre></div><div class="refsect1" id="id-1.9.3.80.5"><h2>Description</h2><p> + <code class="command">CREATE SCHEMA</code> enters a new schema + into the current database. + The schema name must be distinct from the name of any existing schema + in the current database. + </p><p> + A schema is essentially a namespace: + it contains named objects (tables, data types, functions, and operators) + whose names can duplicate those of other objects existing in other + schemas. Named objects are accessed either by <span class="quote">“<span class="quote">qualifying</span>”</span> + their names with the schema name as a prefix, or by setting a search + path that includes the desired schema(s). A <code class="literal">CREATE</code> command + specifying an unqualified object name creates the object + in the current schema (the one at the front of the search path, + which can be determined with the function <code class="function">current_schema</code>). + </p><p> + Optionally, <code class="command">CREATE SCHEMA</code> can include subcommands + to create objects within the new schema. The subcommands are treated + essentially the same as separate commands issued after creating the + schema, except that if the <code class="literal">AUTHORIZATION</code> clause is used, + all the created objects will be owned by that user. + </p></div><div class="refsect1" id="id-1.9.3.80.6"><h2>Parameters</h2><div class="variablelist"><dl class="variablelist"><dt><span class="term"><em class="replaceable"><code>schema_name</code></em></span></dt><dd><p> + The name of a schema to be created. If this is omitted, the + <em class="replaceable"><code>user_name</code></em> + is used as the schema name. The name cannot + begin with <code class="literal">pg_</code>, as such names + are reserved for system schemas. + </p></dd><dt><span class="term"><em class="replaceable"><code>user_name</code></em></span></dt><dd><p> + The role name of the user who will own the new schema. If omitted, + defaults to the user executing the command. To create a schema + owned by another role, you must be a direct or indirect member of + that role, or be a superuser. + </p></dd><dt><span class="term"><em class="replaceable"><code>schema_element</code></em></span></dt><dd><p> + An SQL statement defining an object to be created within the + schema. Currently, only <code class="command">CREATE + TABLE</code>, <code class="command">CREATE VIEW</code>, <code class="command">CREATE + INDEX</code>, <code class="command">CREATE SEQUENCE</code>, <code class="command">CREATE + TRIGGER</code> and <code class="command">GRANT</code> are accepted as clauses + within <code class="command">CREATE SCHEMA</code>. Other kinds of objects may + be created in separate commands after the schema is created. + </p></dd><dt><span class="term"><code class="literal">IF NOT EXISTS</code></span></dt><dd><p> + Do nothing (except issuing a notice) if a schema with the same name + already exists. <em class="replaceable"><code>schema_element</code></em> + subcommands cannot be included when this option is used. + </p></dd></dl></div></div><div class="refsect1" id="id-1.9.3.80.7"><h2>Notes</h2><p> + To create a schema, the invoking user must have the + <code class="literal">CREATE</code> privilege for the current database. + (Of course, superusers bypass this check.) + </p></div><div class="refsect1" id="id-1.9.3.80.8"><h2>Examples</h2><p> + Create a schema: +</p><pre class="programlisting"> +CREATE SCHEMA myschema; +</pre><p> + </p><p> + Create a schema for user <code class="literal">joe</code>; the schema will also be + named <code class="literal">joe</code>: +</p><pre class="programlisting"> +CREATE SCHEMA AUTHORIZATION joe; +</pre><p> + </p><p> + Create a schema named <code class="literal">test</code> that will be owned by user + <code class="literal">joe</code>, unless there already is a schema named <code class="literal">test</code>. + (It does not matter whether <code class="literal">joe</code> owns the pre-existing schema.) +</p><pre class="programlisting"> +CREATE SCHEMA IF NOT EXISTS test AUTHORIZATION joe; +</pre><p> + </p><p> + Create a schema and create a table and view within it: +</p><pre class="programlisting"> +CREATE SCHEMA hollywood + CREATE TABLE films (title text, release date, awards text[]) + CREATE VIEW winners AS + SELECT title, release FROM films WHERE awards IS NOT NULL; +</pre><p> + Notice that the individual subcommands do not end with semicolons. + </p><p> + The following is an equivalent way of accomplishing the same result: +</p><pre class="programlisting"> +CREATE SCHEMA hollywood; +CREATE TABLE hollywood.films (title text, release date, awards text[]); +CREATE VIEW hollywood.winners AS + SELECT title, release FROM hollywood.films WHERE awards IS NOT NULL; +</pre></div><div class="refsect1" id="id-1.9.3.80.9"><h2>Compatibility</h2><p> + The SQL standard allows a <code class="literal">DEFAULT CHARACTER SET</code> clause + in <code class="command">CREATE SCHEMA</code>, as well as more subcommand + types than are presently accepted by + <span class="productname">PostgreSQL</span>. + </p><p> + The SQL standard specifies that the subcommands in <code class="command">CREATE + SCHEMA</code> can appear in any order. The present + <span class="productname">PostgreSQL</span> implementation does not + handle all cases of forward references in subcommands; it might + sometimes be necessary to reorder the subcommands in order to avoid + forward references. + </p><p> + According to the SQL standard, the owner of a schema always owns + all objects within it. <span class="productname">PostgreSQL</span> + allows schemas to contain objects owned by users other than the + schema owner. This can happen only if the schema owner grants the + <code class="literal">CREATE</code> privilege on their schema to someone else, or a + superuser chooses to create objects in it. + </p><p> + The <code class="literal">IF NOT EXISTS</code> option is a + <span class="productname">PostgreSQL</span> extension. + </p></div><div class="refsect1" id="id-1.9.3.80.10"><h2>See Also</h2><span class="simplelist"><a class="xref" href="sql-alterschema.html" title="ALTER SCHEMA"><span class="refentrytitle">ALTER SCHEMA</span></a>, <a class="xref" href="sql-dropschema.html" title="DROP SCHEMA"><span class="refentrytitle">DROP SCHEMA</span></a></span></div></div><div xmlns="http://www.w3.org/TR/xhtml1/transitional" class="navfooter"><hr></hr><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="sql-createrule.html" title="CREATE RULE">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-createsequence.html" title="CREATE SEQUENCE">Next</a></td></tr><tr><td width="40%" align="left" valign="top">CREATE RULE </td><td width="20%" align="center"><a accesskey="h" href="index.html" title="PostgreSQL 13.4 Documentation">Home</a></td><td width="40%" align="right" valign="top"> CREATE SEQUENCE</td></tr></table></div></body></html>
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