blob: 951abbaff608a36ad63a1162b4d075680e798b79 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
|
<?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>53.6. pg_attrdef</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="catalog-pg-amproc.html" title="53.5. pg_amproc" /><link rel="next" href="catalog-pg-attribute.html" title="53.7. pg_attribute" /></head><body id="docContent" class="container-fluid col-10"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="5" align="center">53.6. <code class="structname">pg_attrdef</code></th></tr><tr><td width="10%" align="left"><a accesskey="p" href="catalog-pg-amproc.html" title="53.5. pg_amproc">Prev</a> </td><td width="10%" align="left"><a accesskey="u" href="catalogs.html" title="Chapter 53. System Catalogs">Up</a></td><th width="60%" align="center">Chapter 53. System Catalogs</th><td width="10%" align="right"><a accesskey="h" href="index.html" title="PostgreSQL 16.3 Documentation">Home</a></td><td width="10%" align="right"> <a accesskey="n" href="catalog-pg-attribute.html" title="53.7. pg_attribute">Next</a></td></tr></table><hr /></div><div class="sect1" id="CATALOG-PG-ATTRDEF"><div class="titlepage"><div><div><h2 class="title" style="clear: both">53.6. <code class="structname">pg_attrdef</code> <a href="#CATALOG-PG-ATTRDEF" class="id_link">#</a></h2></div></div></div><a id="id-1.10.4.8.2" class="indexterm"></a><p>
The catalog <code class="structname">pg_attrdef</code> stores column default
values. The main information about columns is stored in
<a class="link" href="catalog-pg-attribute.html" title="53.7. pg_attribute"><code class="structname">pg_attribute</code></a>.
Only columns for which a default value has been explicitly set will have
an entry here.
</p><div class="table" id="id-1.10.4.8.4"><p class="title"><strong>Table 53.6. <code class="structname">pg_attrdef</code> Columns</strong></p><div class="table-contents"><table class="table" summary="pg_attrdef Columns" border="1"><colgroup><col /></colgroup><thead><tr><th class="catalog_table_entry"><p class="column_definition">
Column Type
</p>
<p>
Description
</p></th></tr></thead><tbody><tr><td class="catalog_table_entry"><p class="column_definition">
<code class="structfield">oid</code> <code class="type">oid</code>
</p>
<p>
Row identifier
</p></td></tr><tr><td class="catalog_table_entry"><p class="column_definition">
<code class="structfield">adrelid</code> <code class="type">oid</code>
(references <a class="link" href="catalog-pg-class.html" title="53.11. pg_class"><code class="structname">pg_class</code></a>.<code class="structfield">oid</code>)
</p>
<p>
The table this column belongs to
</p></td></tr><tr><td class="catalog_table_entry"><p class="column_definition">
<code class="structfield">adnum</code> <code class="type">int2</code>
(references <a class="link" href="catalog-pg-attribute.html" title="53.7. pg_attribute"><code class="structname">pg_attribute</code></a>.<code class="structfield">attnum</code>)
</p>
<p>
The number of the column
</p></td></tr><tr><td class="catalog_table_entry"><p class="column_definition">
<code class="structfield">adbin</code> <code class="type">pg_node_tree</code>
</p>
<p>
The column default value, in <code class="function">nodeToString()</code>
representation. Use <code class="literal">pg_get_expr(adbin, adrelid)</code> to
convert it to an SQL expression.
</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="catalog-pg-amproc.html" title="53.5. pg_amproc">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="catalogs.html" title="Chapter 53. System Catalogs">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="catalog-pg-attribute.html" title="53.7. pg_attribute">Next</a></td></tr><tr><td width="40%" align="left" valign="top">53.5. <code class="structname">pg_amproc</code> </td><td width="20%" align="center"><a accesskey="h" href="index.html" title="PostgreSQL 16.3 Documentation">Home</a></td><td width="40%" align="right" valign="top"> 53.7. <code class="structname">pg_attribute</code></td></tr></table></div></body></html>
|
