| Server IP : 103.119.228.120 / Your IP : 3.140.196.5 Web Server : Apache System : Linux v8.techscape8.com 3.10.0-1160.119.1.el7.tuxcare.els2.x86_64 #1 SMP Mon Jul 15 12:09:18 UTC 2024 x86_64 User : nobody ( 99) PHP Version : 5.6.40 Disable Function : shell_exec,symlink,system,exec,proc_get_status,proc_nice,proc_terminate,define_syslog_variables,syslog,openlog,closelog,escapeshellcmd,passthru,ocinum cols,ini_alter,leak,listen,chgrp,apache_note,apache_setenv,debugger_on,debugger_off,ftp_exec,dl,dll,myshellexec,proc_open,socket_bind,proc_close,escapeshellarg,parse_ini_filepopen,fpassthru,exec,passthru,escapeshellarg,escapeshellcmd,proc_close,proc_open,ini_alter,popen,show_source,proc_nice,proc_terminate,proc_get_status,proc_close,pfsockopen,leak,apache_child_terminate,posix_kill,posix_mkfifo,posix_setpgid,posix_setsid,posix_setuid,dl,symlink,shell_exec,system,dl,passthru,escapeshellarg,escapeshellcmd,myshellexec,c99_buff_prepare,c99_sess_put,fpassthru,getdisfunc,fx29exec,fx29exec2,is_windows,disp_freespace,fx29sh_getupdate,fx29_buff_prepare,fx29_sess_put,fx29shexit,fx29fsearch,fx29ftpbrutecheck,fx29sh_tools,fx29sh_about,milw0rm,imagez,sh_name,myshellexec,checkproxyhost,dosyayicek,c99_buff_prepare,c99_sess_put,c99getsource,c99sh_getupdate,c99fsearch,c99shexit,view_perms,posix_getpwuid,posix_getgrgid,posix_kill,parse_perms,parsesort,view_perms_color,set_encoder_input,ls_setcheckboxall,ls_reverse_all,rsg_read,rsg_glob,selfURL,dispsecinfo,unix2DosTime,addFile,system,get_users,view_size,DirFiles,DirFilesWide,DirPrintHTMLHeaders,GetFilesTotal,GetTitles,GetTimeTotal,GetMatchesCount,GetFileMatchesCount,GetResultFiles,fs_copy_dir,fs_copy_obj,fs_move_dir,fs_move_obj,fs_rmdir,SearchText,getmicrotime MySQL : ON | cURL : ON | WGET : ON | Perl : ON | Python : ON | Sudo : ON | Pkexec : ON Directory : /usr/local/ssl/share/doc/postgresql-9.2.24/html/ |
Upload File : |
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<HTML
><HEAD
><TITLE
>character_sets</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 9.2.24 Documentation"
HREF="index.html"><LINK
REL="UP"
TITLE="The Information Schema"
HREF="information-schema.html"><LINK
REL="PREVIOUS"
TITLE="attributes"
HREF="infoschema-attributes.html"><LINK
REL="NEXT"
TITLE="check_constraint_routine_usage"
HREF="infoschema-check-constraint-routine-usage.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="2017-11-06T22:43:11"></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"
><A
HREF="index.html"
>PostgreSQL 9.2.24 Documentation</A
></TH
></TR
><TR
><TD
WIDTH="10%"
ALIGN="left"
VALIGN="top"
><A
TITLE="attributes"
HREF="infoschema-attributes.html"
ACCESSKEY="P"
>Prev</A
></TD
><TD
WIDTH="10%"
ALIGN="left"
VALIGN="top"
><A
HREF="information-schema.html"
ACCESSKEY="U"
>Up</A
></TD
><TD
WIDTH="60%"
ALIGN="center"
VALIGN="bottom"
>Chapter 34. The Information Schema</TD
><TD
WIDTH="20%"
ALIGN="right"
VALIGN="top"
><A
TITLE="check_constraint_routine_usage"
HREF="infoschema-check-constraint-routine-usage.html"
ACCESSKEY="N"
>Next</A
></TD
></TR
></TABLE
><HR
ALIGN="LEFT"
WIDTH="100%"></DIV
><DIV
CLASS="SECT1"
><H1
CLASS="SECT1"
><A
NAME="INFOSCHEMA-CHARACTER-SETS"
>34.7. <TT
CLASS="LITERAL"
>character_sets</TT
></A
></H1
><P
> The view <TT
CLASS="LITERAL"
>character_sets</TT
> identifies the character
sets available in the current database. Since PostgreSQL does not
support multiple character sets within one database, this view only
shows one, which is the database encoding.
</P
><P
> Take note of how the following terms are used in the SQL standard:
<P
></P
></P><DIV
CLASS="VARIABLELIST"
><DL
><DT
>character repertoire</DT
><DD
><P
> An abstract collection of characters, for
example <TT
CLASS="LITERAL"
>UNICODE</TT
>, <TT
CLASS="LITERAL"
>UCS</TT
>, or
<TT
CLASS="LITERAL"
>LATIN1</TT
>. Not exposed as an SQL object, but
visible in this view.
</P
></DD
><DT
>character encoding form</DT
><DD
><P
> An encoding of some character repertoire. Most older character
repertoires only use one encoding form, and so there are no
separate names for them (e.g., <TT
CLASS="LITERAL"
>LATIN1</TT
> is an
encoding form applicable to the <TT
CLASS="LITERAL"
>LATIN1</TT
>
repertoire). But for example Unicode has the encoding forms
<TT
CLASS="LITERAL"
>UTF8</TT
>, <TT
CLASS="LITERAL"
>UTF16</TT
>, etc. (not
all supported by PostgreSQL). Encoding forms are not exposed
as an SQL object, but are visible in this view.
</P
></DD
><DT
>character set</DT
><DD
><P
> A named SQL object that identifies a character repertoire, a
character encoding, and a default collation. A predefined
character set would typically have the same name as an encoding
form, but users could define other names. For example, the
character set <TT
CLASS="LITERAL"
>UTF8</TT
> would typically identify
the character repertoire <TT
CLASS="LITERAL"
>UCS</TT
>, encoding
form <TT
CLASS="LITERAL"
>UTF8</TT
>, and some default collation.
</P
></DD
></DL
></DIV
><P>
You can think of an <SPAN
CLASS="QUOTE"
>"encoding"</SPAN
> in PostgreSQL either as
a character set or a character encoding form. They will have the
same name, and there can only be one in one database.
</P
><DIV
CLASS="TABLE"
><A
NAME="AEN47186"
></A
><P
><B
>Table 34-5. <TT
CLASS="LITERAL"
>character_sets</TT
> Columns</B
></P
><TABLE
BORDER="1"
CLASS="CALSTABLE"
><COL><COL><COL><THEAD
><TR
><TH
>Name</TH
><TH
>Data Type</TH
><TH
>Description</TH
></TR
></THEAD
><TBODY
><TR
><TD
><TT
CLASS="LITERAL"
>character_set_catalog</TT
></TD
><TD
><TT
CLASS="LITERAL"
>sql_identifier</TT
></TD
><TD
>Character sets are currently not implemented as schema objects, so this column is null.</TD
></TR
><TR
><TD
><TT
CLASS="LITERAL"
>character_set_schema</TT
></TD
><TD
><TT
CLASS="LITERAL"
>sql_identifier</TT
></TD
><TD
>Character sets are currently not implemented as schema objects, so this column is null.</TD
></TR
><TR
><TD
><TT
CLASS="LITERAL"
>character_set_name</TT
></TD
><TD
><TT
CLASS="LITERAL"
>sql_identifier</TT
></TD
><TD
>Name of the character set, currently implemented as showing the name of the database encoding</TD
></TR
><TR
><TD
><TT
CLASS="LITERAL"
>character_repertoire</TT
></TD
><TD
><TT
CLASS="LITERAL"
>sql_identifier</TT
></TD
><TD
>Character repertoire, showing <TT
CLASS="LITERAL"
>UCS</TT
> if the encoding is <TT
CLASS="LITERAL"
>UTF8</TT
>, else just the encoding name</TD
></TR
><TR
><TD
><TT
CLASS="LITERAL"
>form_of_use</TT
></TD
><TD
><TT
CLASS="LITERAL"
>sql_identifier</TT
></TD
><TD
>Character encoding form, same as the database encoding</TD
></TR
><TR
><TD
><TT
CLASS="LITERAL"
>default_collate_catalog</TT
></TD
><TD
><TT
CLASS="LITERAL"
>sql_identifier</TT
></TD
><TD
>Name of the database containing the default collation (always the current database, if any collation is identified)</TD
></TR
><TR
><TD
><TT
CLASS="LITERAL"
>default_collate_schema</TT
></TD
><TD
><TT
CLASS="LITERAL"
>sql_identifier</TT
></TD
><TD
>Name of the schema containing the default collation</TD
></TR
><TR
><TD
><TT
CLASS="LITERAL"
>default_collate_name</TT
></TD
><TD
><TT
CLASS="LITERAL"
>sql_identifier</TT
></TD
><TD
> Name of the default collation. The default collation is
identified as the collation that matches
the <TT
CLASS="LITERAL"
>COLLATE</TT
> and <TT
CLASS="LITERAL"
>CTYPE</TT
>
settings of the current database. If there is no such
collation, then this column and the associated schema and
catalog columns are null.
</TD
></TR
></TBODY
></TABLE
></DIV
></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="infoschema-attributes.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="infoschema-check-constraint-routine-usage.html"
ACCESSKEY="N"
>Next</A
></TD
></TR
><TR
><TD
WIDTH="33%"
ALIGN="left"
VALIGN="top"
><TT
CLASS="LITERAL"
>attributes</TT
></TD
><TD
WIDTH="34%"
ALIGN="center"
VALIGN="top"
><A
HREF="information-schema.html"
ACCESSKEY="U"
>Up</A
></TD
><TD
WIDTH="33%"
ALIGN="right"
VALIGN="top"
><TT
CLASS="LITERAL"
>check_constraint_routine_usage</TT
></TD
></TR
></TABLE
></DIV
></BODY
></HTML
>