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><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.
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