begriffs open source - ai-pg/blob - full-docs/html/infoschema-sql-features.html

   1 <?xml version="1.0" encoding="UTF-8" standalone="no"?>
   2 <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /><title>35.48. sql_features</title><link rel="stylesheet" type="text/css" href="stylesheet.css" /><link rev="made" href="pgsql-docs@lists.postgresql.org" /><meta name="generator" content="DocBook XSL Stylesheets Vsnapshot" /><link rel="prev" href="infoschema-sequences.html" title="35.47. sequences" /><link rel="next" href="infoschema-sql-implementation-info.html" title="35.49. sql_implementation_info" /></head><body id="docContent" class="container-fluid col-10"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="5" align="center">35.48. <code class="literal">sql_features</code></th></tr><tr><td width="10%" align="left"><a accesskey="p" href="infoschema-sequences.html" title="35.47. sequences">Prev</a> </td><td width="10%" align="left"><a accesskey="u" href="information-schema.html" title="Chapter 35. The Information Schema">Up</a></td><th width="60%" align="center">Chapter 35. The Information Schema</th><td width="10%" align="right"><a accesskey="h" href="index.html" title="PostgreSQL 18.0 Documentation">Home</a></td><td width="10%" align="right"> <a accesskey="n" href="infoschema-sql-implementation-info.html" title="35.49. sql_implementation_info">Next</a></td></tr></table><hr /></div><div class="sect1" id="INFOSCHEMA-SQL-FEATURES"><div class="titlepage"><div><div><h2 class="title" style="clear: both">35.48. <code class="literal">sql_features</code> <a href="#INFOSCHEMA-SQL-FEATURES" class="id_link">#</a></h2></div></div></div><p>
   3    The table <code class="literal">sql_features</code> contains information
   4    about which formal features defined in the SQL standard are
   5    supported by <span class="productname">PostgreSQL</span>.  This is the
   6    same information that is presented in <a class="xref" href="features.html" title="Appendix D. SQL Conformance">Appendix D</a>.
   7    There you can also find some additional background information.
   8   </p><div class="table" id="id-1.7.6.52.3"><p class="title"><strong>Table 35.46. <code class="structname">sql_features</code> Columns</strong></p><div class="table-contents"><table class="table" summary="sql_features Columns" border="1"><colgroup><col /></colgroup><thead><tr><th class="catalog_table_entry"><p class="column_definition">
   9        Column Type
  10       </p>
  11       <p>
  12        Description
  13       </p></th></tr></thead><tbody><tr><td class="catalog_table_entry"><p class="column_definition">
  14        <code class="structfield">feature_id</code> <code class="type">character_data</code>
  15       </p>
  16       <p>
  17        Identifier string of the feature
  18       </p></td></tr><tr><td class="catalog_table_entry"><p class="column_definition">
  19        <code class="structfield">feature_name</code> <code class="type">character_data</code>
  20       </p>
  21       <p>
  22        Descriptive name of the feature
  23       </p></td></tr><tr><td class="catalog_table_entry"><p class="column_definition">
  24        <code class="structfield">sub_feature_id</code> <code class="type">character_data</code>
  25       </p>
  26       <p>
  27        Identifier string of the subfeature, or a zero-length string if not a subfeature
  28       </p></td></tr><tr><td class="catalog_table_entry"><p class="column_definition">
  29        <code class="structfield">sub_feature_name</code> <code class="type">character_data</code>
  30       </p>
  31       <p>
  32        Descriptive name of the subfeature, or a zero-length string if not a subfeature
  33       </p></td></tr><tr><td class="catalog_table_entry"><p class="column_definition">
  34        <code class="structfield">is_supported</code> <code class="type">yes_or_no</code>
  35       </p>
  36       <p>
  37        <code class="literal">YES</code> if the feature is fully supported by the
  38        current version of <span class="productname">PostgreSQL</span>, <code class="literal">NO</code> if not
  39       </p></td></tr><tr><td class="catalog_table_entry"><p class="column_definition">
  40        <code class="structfield">is_verified_by</code> <code class="type">character_data</code>
  41       </p>
  42       <p>
  43        Always null, since the <span class="productname">PostgreSQL</span> development group does not
  44        perform formal testing of feature conformance
  45       </p></td></tr><tr><td class="catalog_table_entry"><p class="column_definition">
  46        <code class="structfield">comments</code> <code class="type">character_data</code>
  47       </p>
  48       <p>
  49        Possibly a comment about the supported status of the feature
  50       </p></td></tr></tbody></table></div></div><br class="table-break" /></div><div class="navfooter"><hr /><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="infoschema-sequences.html" title="35.47. sequences">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="information-schema.html" title="Chapter 35. The Information Schema">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="infoschema-sql-implementation-info.html" title="35.49. sql_implementation_info">Next</a></td></tr><tr><td width="40%" align="left" valign="top">35.47. <code class="literal">sequences</code> </td><td width="20%" align="center"><a accesskey="h" href="index.html" title="PostgreSQL 18.0 Documentation">Home</a></td><td width="40%" align="right" valign="top"> 35.49. <code class="literal">sql_implementation_info</code></td></tr></table></div></body></html>