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| author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-13 13:44:03 +0000 |
|---|---|---|
| committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-13 13:44:03 +0000 |
| commit | 293913568e6a7a86fd1479e1cff8e2ecb58d6568 (patch) | |
| tree | fc3b469a3ec5ab71b36ea97cc7aaddb838423a0c /doc/src/sgml/html/features.html | |
| parent | Initial commit. (diff) | |
| download | postgresql-16-293913568e6a7a86fd1479e1cff8e2ecb58d6568.tar.xz postgresql-16-293913568e6a7a86fd1479e1cff8e2ecb58d6568.zip | |
Adding upstream version 16.2.upstream/16.2
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'doc/src/sgml/html/features.html')
| -rw-r--r-- | doc/src/sgml/html/features.html | 73 |
1 files changed, 73 insertions, 0 deletions
diff --git a/doc/src/sgml/html/features.html b/doc/src/sgml/html/features.html new file mode 100644 index 0000000..408b606 --- /dev/null +++ b/doc/src/sgml/html/features.html @@ -0,0 +1,73 @@ +<?xml version="1.0" encoding="UTF-8" standalone="no"?> +<!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>Appendix D. SQL Conformance</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="sql-keywords-appendix.html" title="Appendix C. SQL Key Words" /><link rel="next" href="features-sql-standard.html" title="D.1. Supported Features" /></head><body id="docContent" class="container-fluid col-10"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="5" align="center">Appendix D. SQL Conformance</th></tr><tr><td width="10%" align="left"><a accesskey="p" href="sql-keywords-appendix.html" title="Appendix C. SQL Key Words">Prev</a> </td><td width="10%" align="left"><a accesskey="u" href="appendixes.html" title="Part VIII. Appendixes">Up</a></td><th width="60%" align="center">Part VIII. Appendixes</th><td width="10%" align="right"><a accesskey="h" href="index.html" title="PostgreSQL 16.2 Documentation">Home</a></td><td width="10%" align="right"> <a accesskey="n" href="features-sql-standard.html" title="D.1. Supported Features">Next</a></td></tr></table><hr /></div><div class="appendix" id="FEATURES"><div class="titlepage"><div><div><h2 class="title">Appendix D. SQL Conformance</h2></div></div></div><div class="toc"><p><strong>Table of Contents</strong></p><dl class="toc"><dt><span class="sect1"><a href="features-sql-standard.html">D.1. Supported Features</a></span></dt><dt><span class="sect1"><a href="unsupported-features-sql-standard.html">D.2. Unsupported Features</a></span></dt><dt><span class="sect1"><a href="xml-limits-conformance.html">D.3. XML Limits and Conformance to SQL/XML</a></span></dt><dd><dl><dt><span class="sect2"><a href="xml-limits-conformance.html#FUNCTIONS-XML-LIMITS-XPATH1">D.3.1. Queries Are Restricted to XPath 1.0</a></span></dt><dt><span class="sect2"><a href="xml-limits-conformance.html#FUNCTIONS-XML-LIMITS-POSTGRESQL">D.3.2. Incidental Limits of the Implementation</a></span></dt></dl></dd></dl></div><p> + This section attempts to outline to what extent + <span class="productname">PostgreSQL</span> conforms to the current SQL + standard. The following information is not a full statement of + conformance, but it presents the main topics in as much detail as is + both reasonable and useful for users. + </p><p> + The formal name of the SQL standard is ISO/IEC 9075 <span class="quote">“<span class="quote">Database + Language SQL</span>”</span>. A revised version of the standard is released + from time to time; the most recent update appearing in 2023. + The 2023 version is referred to as ISO/IEC 9075:2023, or simply as SQL:2023. + The versions prior to that were SQL:2016, SQL:2011, SQL:2008, SQL:2006, SQL:2003, + SQL:1999, and SQL-92. Each version + replaces the previous one, so claims of conformance to earlier + versions have no official merit. + <span class="productname">PostgreSQL</span> development aims for + conformance with the latest official version of the standard where + such conformance does not contradict traditional features or common + sense. Many of the features required by the SQL + standard are supported, though sometimes with slightly differing + syntax or function. Further moves towards conformance can be + expected over time. + </p><p> + <acronym class="acronym">SQL-92</acronym> defined three feature sets for + conformance: Entry, Intermediate, and Full. Most database + management systems claiming <acronym class="acronym">SQL</acronym> standard + conformance were conforming at only the Entry level, since the + entire set of features in the Intermediate and Full levels was + either too voluminous or in conflict with legacy behaviors. + </p><p> + Starting with <acronym class="acronym">SQL:1999</acronym>, the SQL standard defines + a large set of individual features rather than the ineffectively + broad three levels found in <acronym class="acronym">SQL-92</acronym>. A large + subset of these features represents the <span class="quote">“<span class="quote">Core</span>”</span> + features, which every conforming SQL implementation must supply. + The rest of the features are purely optional. + </p><p> + The standard is split into a number of parts, each also known by a shorthand + name: + + </p><div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem"><p>ISO/IEC 9075-1 Framework (SQL/Framework)</p><a id="id-1.11.5.6.1.1.2" class="indexterm"></a></li><li class="listitem"><p>ISO/IEC 9075-2 Foundation (SQL/Foundation)</p><a id="id-1.11.5.6.1.2.2" class="indexterm"></a></li><li class="listitem"><p>ISO/IEC 9075-3 Call Level Interface (SQL/CLI)</p><a id="id-1.11.5.6.1.3.2" class="indexterm"></a></li><li class="listitem"><p>ISO/IEC 9075-4 Persistent Stored Modules (SQL/PSM)</p><a id="id-1.11.5.6.1.4.2" class="indexterm"></a></li><li class="listitem"><p>ISO/IEC 9075-9 Management of External Data (SQL/MED)</p><a id="id-1.11.5.6.1.5.2" class="indexterm"></a></li><li class="listitem"><p>ISO/IEC 9075-10 Object Language Bindings (SQL/OLB)</p><a id="id-1.11.5.6.1.6.2" class="indexterm"></a></li><li class="listitem"><p>ISO/IEC 9075-11 Information and Definition Schemas (SQL/Schemata)</p><a id="id-1.11.5.6.1.7.2" class="indexterm"></a></li><li class="listitem"><p>ISO/IEC 9075-13 Routines and Types using the Java Language (SQL/JRT)</p><a id="id-1.11.5.6.1.8.2" class="indexterm"></a></li><li class="listitem"><p>ISO/IEC 9075-14 XML-related specifications (SQL/XML)</p><a id="id-1.11.5.6.1.9.2" class="indexterm"></a></li><li class="listitem"><p>ISO/IEC 9075-15 Multi-dimensional arrays (SQL/MDA)</p><a id="id-1.11.5.6.1.10.2" class="indexterm"></a></li><li class="listitem"><p>ISO/IEC 9075-16 Property Graph Queries (SQL/PGQ)</p><a id="id-1.11.5.6.1.11.2" class="indexterm"></a></li></ul></div><p> + + Note that some part numbers are not (or no longer) used. + </p><p> + The <span class="productname">PostgreSQL</span> core covers parts 1, 2, 9, + 11, and 14. Part 3 is covered by the ODBC driver, and part 13 is + covered by the PL/Java plug-in, but exact conformance is currently + not being verified for these components. There are currently no + implementations of parts 4, 10, 15, and 16 + for <span class="productname">PostgreSQL</span>. + </p><p> + PostgreSQL supports most of the major features of SQL:2023. Out of + 177 mandatory features required for full Core conformance, + PostgreSQL conforms to at least 170. In addition, there is a long + list of supported optional features. It might be worth noting that at + the time of writing, no current version of any database management + system claims full conformance to Core SQL:2023. + </p><p> + In the following two sections, we provide a list of those features + that <span class="productname">PostgreSQL</span> supports, followed by a + list of the features defined in <acronym class="acronym">SQL:2023</acronym> which + are not yet supported in <span class="productname">PostgreSQL</span>. + Both of these lists are approximate: There might be minor details that + are nonconforming for a feature that is listed as supported, and + large parts of an unsupported feature might in fact be implemented. + The main body of the documentation always contains the most accurate + information about what does and does not work. + </p><div class="note"><h3 class="title">Note</h3><p> + Feature codes containing a hyphen are subfeatures. Therefore, if a + particular subfeature is not supported, the main feature is listed + as unsupported even if some other subfeatures are supported. + </p></div></div><div class="navfooter"><hr /><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="sql-keywords-appendix.html" title="Appendix C. SQL Key Words">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="appendixes.html" title="Part VIII. Appendixes">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="features-sql-standard.html" title="D.1. Supported Features">Next</a></td></tr><tr><td width="40%" align="left" valign="top">Appendix C. <acronym class="acronym">SQL</acronym> Key Words </td><td width="20%" align="center"><a accesskey="h" href="index.html" title="PostgreSQL 16.2 Documentation">Home</a></td><td width="40%" align="right" valign="top"> D.1. Supported Features</td></tr></table></div></body></html>
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