Sophie: postgresql8.3-docs-8.3.6-2mdv2008.1 x86

postgresql8.3-docs-8.3.6-2mdv2008.1.x86_64.rpm

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>33.2. Data Types</A
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>   The columns of the information schema views use special data types
   that are defined in the information schema.  These are defined as
   simple domains over ordinary built-in types.  You should not use
   these types for work outside the information schema, but your
   applications must be prepared for them if they select from the
   information schema.
  </P
><P
>   These types are:

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><DL
><DT
><TT
CLASS="TYPE"
>cardinal_number</TT
></DT
><DD
><P
>       A nonnegative integer.
      </P
></DD
><DT
><TT
CLASS="TYPE"
>character_data</TT
></DT
><DD
><P
>       A character string (without specific maximum length).
      </P
></DD
><DT
><TT
CLASS="TYPE"
>sql_identifier</TT
></DT
><DD
><P
>       A character string.  This type is used for SQL identifiers, the
       type <TT
CLASS="TYPE"
>character_data</TT
> is used for any other kind of
       text data.
      </P
></DD
><DT
><TT
CLASS="TYPE"
>time_stamp</TT
></DT
><DD
><P
>       A domain over the type <TT
CLASS="TYPE"
>timestamp with time zone</TT
>
      </P
></DD
></DL
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><P>

   Every column in the information schema has one of these four types.
  </P
><P
>   Boolean (true/false) data is represented in the information schema
   by a column of type <TT
CLASS="TYPE"
>character_data</TT
> that contains
   either <TT
CLASS="LITERAL"
>YES</TT
> or <TT
CLASS="LITERAL"
>NO</TT
>.  (The
   information schema was invented before the type
   <TT
CLASS="TYPE"
>boolean</TT
> was added to the SQL standard, so this
   convention is necessary to keep the information schema backward
   compatible.)
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