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NAME="INFOSCHEMA-SQL-FEATURES"
>33.32. <TT
CLASS="LITERAL"
>sql_features</TT
></A
></H1
><P
>   The table <TT
CLASS="LITERAL"
>sql_features</TT
> contains information
   about which formal features defined in the SQL standard are
   supported by <SPAN
CLASS="PRODUCTNAME"
>PostgreSQL</SPAN
>.  This is the
   same information that is presented in <A
HREF="features.html"
>Appendix D</A
>.
   There you can also find some additional background information.
  </P
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><B
>Table 33-30. <TT
CLASS="LITERAL"
>sql_features</TT
> Columns</B
></P
><TABLE
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><COL><COL><COL><THEAD
><TR
><TH
>Name</TH
><TH
>Data Type</TH
><TH
>Description</TH
></TR
></THEAD
><TBODY
><TR
><TD
><TT
CLASS="LITERAL"
>feature_id</TT
></TD
><TD
><TT
CLASS="TYPE"
>character_data</TT
></TD
><TD
>Identifier string of the feature</TD
></TR
><TR
><TD
><TT
CLASS="LITERAL"
>feature_name</TT
></TD
><TD
><TT
CLASS="TYPE"
>character_data</TT
></TD
><TD
>Descriptive name of the feature</TD
></TR
><TR
><TD
><TT
CLASS="LITERAL"
>sub_feature_id</TT
></TD
><TD
><TT
CLASS="TYPE"
>character_data</TT
></TD
><TD
>Identifier string of the subfeature, or a zero-length string if not a subfeature</TD
></TR
><TR
><TD
><TT
CLASS="LITERAL"
>sub_feature_name</TT
></TD
><TD
><TT
CLASS="TYPE"
>character_data</TT
></TD
><TD
>Descriptive name of the subfeature, or a zero-length string if not a subfeature</TD
></TR
><TR
><TD
><TT
CLASS="LITERAL"
>is_supported</TT
></TD
><TD
><TT
CLASS="TYPE"
>character_data</TT
></TD
><TD
>       <TT
CLASS="LITERAL"
>YES</TT
> if the feature is fully supported by the
       current version of <SPAN
CLASS="PRODUCTNAME"
>PostgreSQL</SPAN
>, <TT
CLASS="LITERAL"
>NO</TT
> if not
      </TD
></TR
><TR
><TD
><TT
CLASS="LITERAL"
>is_verified_by</TT
></TD
><TD
><TT
CLASS="TYPE"
>character_data</TT
></TD
><TD
>       Always null, since the <SPAN
CLASS="PRODUCTNAME"
>PostgreSQL</SPAN
> development group does not
       perform formal testing of feature conformance
      </TD
></TR
><TR
><TD
><TT
CLASS="LITERAL"
>comments</TT
></TD
><TD
><TT
CLASS="TYPE"
>character_data</TT
></TD
><TD
>Possibly a comment about the supported status of the feature</TD
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