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| author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-16 19:46:48 +0000 |
|---|---|---|
| committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-16 19:46:48 +0000 |
| commit | 311bcfc6b3acdd6fd152798c7f287ddf74fa2a98 (patch) | |
| tree | 0ec307299b1dada3701e42f4ca6eda57d708261e /doc/src/sgml/html/tutorial-views.html | |
| parent | Initial commit. (diff) | |
| download | postgresql-15-311bcfc6b3acdd6fd152798c7f287ddf74fa2a98.tar.xz postgresql-15-311bcfc6b3acdd6fd152798c7f287ddf74fa2a98.zip | |
Adding upstream version 15.4.upstream/15.4upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'doc/src/sgml/html/tutorial-views.html')
| -rw-r--r-- | doc/src/sgml/html/tutorial-views.html | 26 |
1 files changed, 26 insertions, 0 deletions
diff --git a/doc/src/sgml/html/tutorial-views.html b/doc/src/sgml/html/tutorial-views.html new file mode 100644 index 0000000..607d019 --- /dev/null +++ b/doc/src/sgml/html/tutorial-views.html @@ -0,0 +1,26 @@ +<?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>3.2. Views</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="tutorial-advanced-intro.html" title="3.1. Introduction" /><link rel="next" href="tutorial-fk.html" title="3.3. Foreign Keys" /></head><body id="docContent" class="container-fluid col-10"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="5" align="center">3.2. Views</th></tr><tr><td width="10%" align="left"><a accesskey="p" href="tutorial-advanced-intro.html" title="3.1. Introduction">Prev</a> </td><td width="10%" align="left"><a accesskey="u" href="tutorial-advanced.html" title="Chapter 3. Advanced Features">Up</a></td><th width="60%" align="center">Chapter 3. Advanced Features</th><td width="10%" align="right"><a accesskey="h" href="index.html" title="PostgreSQL 15.4 Documentation">Home</a></td><td width="10%" align="right"> <a accesskey="n" href="tutorial-fk.html" title="3.3. Foreign Keys">Next</a></td></tr></table><hr /></div><div class="sect1" id="TUTORIAL-VIEWS"><div class="titlepage"><div><div><h2 class="title" style="clear: both">3.2. Views</h2></div></div></div><a id="id-1.4.5.3.2" class="indexterm"></a><p> + Refer back to the queries in <a class="xref" href="tutorial-join.html" title="2.6. Joins Between Tables">Section 2.6</a>. + Suppose the combined listing of weather records and city location + is of particular interest to your application, but you do not want + to type the query each time you need it. You can create a + <em class="firstterm">view</em> over the query, which gives a name to + the query that you can refer to like an ordinary table: + +</p><pre class="programlisting"> +CREATE VIEW myview AS + SELECT name, temp_lo, temp_hi, prcp, date, location + FROM weather, cities + WHERE city = name; + +SELECT * FROM myview; +</pre><p> + </p><p> + Making liberal use of views is a key aspect of good SQL database + design. Views allow you to encapsulate the details of the + structure of your tables, which might change as your application + evolves, behind consistent interfaces. + </p><p> + Views can be used in almost any place a real table can be used. + Building views upon other views is not uncommon. + </p></div><div class="navfooter"><hr /><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="tutorial-advanced-intro.html" title="3.1. Introduction">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="tutorial-advanced.html" title="Chapter 3. Advanced Features">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="tutorial-fk.html" title="3.3. Foreign Keys">Next</a></td></tr><tr><td width="40%" align="left" valign="top">3.1. Introduction </td><td width="20%" align="center"><a accesskey="h" href="index.html" title="PostgreSQL 15.4 Documentation">Home</a></td><td width="40%" align="right" valign="top"> 3.3. Foreign Keys</td></tr></table></div></body></html>
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