<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <HTML ><HEAD ><TITLE >Privileges</TITLE ><META NAME="GENERATOR" CONTENT="Modular DocBook HTML Stylesheet Version 1.79"><LINK REV="MADE" HREF="mailto:pgsql-docs@postgresql.org"><LINK REL="HOME" TITLE="PostgreSQL 8.0.11 Documentation" HREF="index.html"><LINK REL="UP" TITLE="Data Definition" HREF="ddl.html"><LINK REL="PREVIOUS" TITLE="Modifying Tables" HREF="ddl-alter.html"><LINK REL="NEXT" TITLE="Schemas" HREF="ddl-schemas.html"><LINK REL="STYLESHEET" TYPE="text/css" HREF="stylesheet.css"><META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=ISO-8859-1"><META NAME="creation" CONTENT="2007-02-02T03:57:22"></HEAD ><BODY CLASS="SECT1" ><DIV CLASS="NAVHEADER" ><TABLE SUMMARY="Header navigation table" WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" ><TR ><TH COLSPAN="5" ALIGN="center" VALIGN="bottom" >PostgreSQL 8.0.11 Documentation</TH ></TR ><TR ><TD WIDTH="10%" ALIGN="left" VALIGN="top" ><A HREF="ddl-alter.html" ACCESSKEY="P" >Prev</A ></TD ><TD WIDTH="10%" ALIGN="left" VALIGN="top" ><A HREF="ddl.html" >Fast Backward</A ></TD ><TD WIDTH="60%" ALIGN="center" VALIGN="bottom" >Chapter 5. Data Definition</TD ><TD WIDTH="10%" ALIGN="right" VALIGN="top" ><A HREF="ddl.html" >Fast Forward</A ></TD ><TD WIDTH="10%" ALIGN="right" VALIGN="top" ><A HREF="ddl-schemas.html" ACCESSKEY="N" >Next</A ></TD ></TR ></TABLE ><HR ALIGN="LEFT" WIDTH="100%"></DIV ><DIV CLASS="SECT1" ><H1 CLASS="SECT1" ><A NAME="DDL-PRIV" >5.7. Privileges</A ></H1 ><A NAME="AEN2358" ></A ><A NAME="AEN2360" ></A ><P > When you create a database object, you become its owner. By default, only the owner of an object can do anything with the object. In order to allow other users to use it, <I CLASS="FIRSTTERM" >privileges</I > must be granted. (However, users that have the superuser attribute can always access any object.) </P ><P > There are several different privileges: <TT CLASS="LITERAL" >SELECT</TT >, <TT CLASS="LITERAL" >INSERT</TT >, <TT CLASS="LITERAL" >UPDATE</TT >, <TT CLASS="LITERAL" >DELETE</TT >, <TT CLASS="LITERAL" >RULE</TT >, <TT CLASS="LITERAL" >REFERENCES</TT >, <TT CLASS="LITERAL" >TRIGGER</TT >, <TT CLASS="LITERAL" >CREATE</TT >, <TT CLASS="LITERAL" >TEMPORARY</TT >, <TT CLASS="LITERAL" >EXECUTE</TT >, and <TT CLASS="LITERAL" >USAGE</TT >. The privileges applicable to a particular object vary depending on the object's type (table, function, etc). For complete information on the different types of privileges supported by <SPAN CLASS="PRODUCTNAME" >PostgreSQL</SPAN >, refer to the <A HREF="sql-grant.html" >GRANT</A > reference page. The following sections and chapters will also show you how those privileges are used. </P ><P > The right to modify or destroy an object is always the privilege of the owner only. </P ><DIV CLASS="NOTE" ><BLOCKQUOTE CLASS="NOTE" ><P ><B >Note: </B > To change the owner of a table, index, sequence, or view, use the <A HREF="sql-altertable.html" >ALTER TABLE</A > command. There are corresponding <TT CLASS="LITERAL" >ALTER</TT > commands for other object types. </P ></BLOCKQUOTE ></DIV ><P > To assign privileges, the <TT CLASS="COMMAND" >GRANT</TT > command is used. For example, if <TT CLASS="LITERAL" >joe</TT > is an existing user, and <TT CLASS="LITERAL" >accounts</TT > is an existing table, the privilege to update the table can be granted with </P><PRE CLASS="PROGRAMLISTING" >GRANT UPDATE ON accounts TO joe;</PRE ><P> To grant a privilege to a group, use this syntax: </P><PRE CLASS="PROGRAMLISTING" >GRANT SELECT ON accounts TO GROUP staff;</PRE ><P> The special <SPAN CLASS="QUOTE" >"user"</SPAN > name <TT CLASS="LITERAL" >PUBLIC</TT > can be used to grant a privilege to every user on the system. Writing <TT CLASS="LITERAL" >ALL</TT > in place of a specific privilege grants all privileges that are relevant for the object type. </P ><P > To revoke a privilege, use the fittingly named <TT CLASS="COMMAND" >REVOKE</TT > command: </P><PRE CLASS="PROGRAMLISTING" >REVOKE ALL ON accounts FROM PUBLIC;</PRE ><P> The special privileges of the object owner (i.e., the right to do <TT CLASS="COMMAND" >DROP</TT >, <TT CLASS="COMMAND" >GRANT</TT >, <TT CLASS="COMMAND" >REVOKE</TT >, etc.) are always implicit in being the owner, and cannot be granted or revoked. But the object owner can choose to revoke his own ordinary privileges, for example to make a table read-only for himself as well as others. </P ><P > Ordinarily, only the object's owner (or a superuser) can grant or revoke privileges on an object. However, it is possible to grant a privilege <SPAN CLASS="QUOTE" >"with grant option"</SPAN >, which gives the recipient the right to grant it in turn to others. If the grant option is subsequently revoked then all who received the privilege from that recipient (directly or through a chain of grants) will lose the privilege. For details see the <A HREF="sql-grant.html" >GRANT</A > and <A HREF="sql-revoke.html" >REVOKE</A > reference pages. </P ></DIV ><DIV CLASS="NAVFOOTER" ><HR ALIGN="LEFT" WIDTH="100%"><TABLE SUMMARY="Footer navigation table" WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" ><A HREF="ddl-alter.html" ACCESSKEY="P" >Prev</A ></TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" ><A HREF="index.html" ACCESSKEY="H" >Home</A ></TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" ><A HREF="ddl-schemas.html" ACCESSKEY="N" >Next</A ></TD ></TR ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" >Modifying Tables</TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" ><A HREF="ddl.html" ACCESSKEY="U" >Up</A ></TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" >Schemas</TD ></TR ></TABLE ></DIV ></BODY ></HTML >