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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <HTML ><HEAD ><TITLE >sql_features</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="sequences" HREF="infoschema-sequences.html"><LINK REL="NEXT" TITLE="sql_implementation_info" HREF="infoschema-sql-implementation-info.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="sequences" HREF="infoschema-sequences.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="sql_implementation_info" HREF="infoschema-sql-implementation-info.html" ACCESSKEY="N" >Next</A ></TD ></TR ></TABLE ><HR ALIGN="LEFT" WIDTH="100%"></DIV ><DIV CLASS="SECT1" ><H1 CLASS="SECT1" ><A NAME="INFOSCHEMA-SQL-FEATURES" >34.43. <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 ><DIV CLASS="TABLE" ><A NAME="AEN50591" ></A ><P ><B >Table 34-41. <TT CLASS="LITERAL" >sql_features</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" >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" >yes_or_no</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 ></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-sequences.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-sql-implementation-info.html" ACCESSKEY="N" >Next</A ></TD ></TR ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" ><TT CLASS="LITERAL" >sequences</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" >sql_implementation_info</TT ></TD ></TR ></TABLE ></DIV ></BODY ></HTML >