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<?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>52.13. pg_constraint</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-collation.html" title="52.12. pg_collation" /><link rel="next" href="catalog-pg-conversion.html" title="52.14. pg_conversion" /><meta name="viewport" content="width=device-width,initial-scale=1.0" /></head><body id="docContent" class="container-fluid col-10"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="4" align="center"><a accesskey="h" href="index.html">PostgreSQL 14.5文書</a></th></tr><tr><td width="10%" align="left"></td><td width="10%" align="left"></td><td width="60%" align="center"><a href="catalogs.html" title="第52章 システムカタログ">第52章 システムカタログ</a></td><td width="20%" align="right"><div class="actions"><a class="issue" title="github" href="https://github.com/pgsql-jp/jpug-doc/issues/new?template=bug_report.yml&what-happened=version 14.5 : catalog-pg-constraint.html">誤訳等の報告
</a></div></td></tr><tr><td width="10%" align="left"><a accesskey="p" href="catalog-pg-collation.html" title="52.12. pg_collation">前へ</a> </td><td width="10%" align="left"><a accesskey="u" href="catalogs.html" title="第52章 システムカタログ">上へ</a></td><td width="60%" align="center">52.13. <code class="structname">pg_constraint</code></td><td width="20%" align="right"> <a accesskey="n" href="catalog-pg-conversion.html" title="52.14. pg_conversion">次へ</a></td></tr></table><hr /></div><div class="sect1" id="CATALOG-PG-CONSTRAINT"><div class="titlepage"><div><div><h2 class="title" style="clear: both">52.13. <code class="structname">pg_constraint</code></h2></div></div></div><a id="id-1.10.4.15.2" class="indexterm"></a><p>
<span class="original">
The catalog <structname>pg_constraint</structname> stores check, primary
key, unique, foreign key, and exclusion constraints on tables.
(Column constraints are not treated specially. Every column constraint is
equivalent to some table constraint.)
Not-null constraints are represented in the
<link linkend="catalog-pg-attribute"><structname>pg_attribute</structname></link>
catalog, not here.
</span>
<code class="structname">pg_constraint</code>カタログはテーブル上の検査制約、主キー制約、一意性制約、外部キー制約、排他制約を格納します
(列制約は特別扱いされていません。
全ての列制約は何らかのテーブル制約と同等です。)
非NULL制約はここではなく、<a class="link" href="catalog-pg-attribute.html" title="52.7. pg_attribute"><code class="structname">pg_attribute</code></a>カタログで示されます。
</p><p>
<span class="original">
User-defined constraint triggers (created with <link linkend="sql-createtrigger">
<command>CREATE CONSTRAINT TRIGGER</command></link>) also give rise to an entry in this table.
</span>
(<a class="link" href="sql-createtrigger.html" title="CREATE TRIGGER"><code class="command">CREATE CONSTRAINT TRIGGER</code></a>で作成される)ユーザ定義の制約トリガもこのテーブルの項目の元になります。
</p><p>
<span class="original">
Check constraints on domains are stored here, too.
</span>
ドメイン上の検査制約もここに格納されます。
</p><div class="table" id="id-1.10.4.15.6"><p class="title"><strong>表52.13 <code class="structname">pg_constraint</code>の列</strong></p><div class="table-contents"><span class="original">
<title><structname>pg_constraint</structname> Columns</title>
</span><table class="table" summary="pg_constraintの列" border="1"><colgroup><col /></colgroup><thead><tr><th class="catalog_table_entry"><p class="column_definition">
<span class="original">
Column Type
</span>
列 型
</p>
<p>
<span class="original">
Description
</span>
説明
</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>
<span class="original">
Row identifier
</span>
行識別子
</p></td></tr><tr><td class="catalog_table_entry"><p class="column_definition">
<code class="structfield">conname</code> <code class="type">name</code>
</p>
<p>
<span class="original">
Constraint name (not necessarily unique!)
</span>
制約名(一意である必要はありません)。
</p></td></tr><tr><td class="catalog_table_entry"><p class="column_definition">
<code class="structfield">connamespace</code> <code class="type">oid</code>
<span class="original">
(references <link linkend="catalog-pg-namespace"><structname>pg_namespace</structname></link>.<structfield>oid</structfield>)
</span>
(参照先 <a class="link" href="catalog-pg-namespace.html" title="52.32. pg_namespace"><code class="structname">pg_namespace</code></a>.<code class="structfield">oid</code>)
</p>
<p>
<span class="original">
The OID of the namespace that contains this constraint
</span>
この制約を含む名前空間のOID。
</p></td></tr><tr><td class="catalog_table_entry"><p class="column_definition">
<code class="structfield">contype</code> <code class="type">char</code>
</p>
<p>
<span class="original">
<literal>c</literal> = check constraint,
<literal>f</literal> = foreign key constraint,
<literal>p</literal> = primary key constraint,
<literal>u</literal> = unique constraint,
<literal>t</literal> = constraint trigger,
<literal>x</literal> = exclusion constraint
</span>
<code class="literal">c</code> = 検査制約、
<code class="literal">f</code> = 外部キー制約、
<code class="literal">p</code> = 主キー制約、
<code class="literal">u</code> = 一意性制約、
<code class="literal">t</code> = 制約トリガ,
<code class="literal">x</code> = 排他制約
</p></td></tr><tr><td class="catalog_table_entry"><p class="column_definition">
<code class="structfield">condeferrable</code> <code class="type">bool</code>
</p>
<p>
<span class="original">
Is the constraint deferrable?
</span>
制約は遅延可能かどうか?
</p></td></tr><tr><td class="catalog_table_entry"><p class="column_definition">
<code class="structfield">condeferred</code> <code class="type">bool</code>
</p>
<p>
<span class="original">
Is the constraint deferred by default?
</span>
制約はデフォルトで遅延可能かどうか?
</p></td></tr><tr><td class="catalog_table_entry"><p class="column_definition">
<code class="structfield">convalidated</code> <code class="type">bool</code>
</p>
<p>
<span class="original">
Has the constraint been validated?
Currently, can be false only for foreign keys and CHECK constraints
</span>
制約が検証されているか?現時点では外部キーとチェック制約の場合のみ偽になる可能性があります。
</p></td></tr><tr><td class="catalog_table_entry"><p class="column_definition">
<code class="structfield">conrelid</code> <code class="type">oid</code>
<span class="original">
(references <link linkend="catalog-pg-class"><structname>pg_class</structname></link>.<structfield>oid</structfield>)
</span>
(参照先 <a class="link" href="catalog-pg-class.html" title="52.11. pg_class"><code class="structname">pg_class</code></a>.<code class="structfield">oid</code>)
</p>
<p>
<span class="original">
The table this constraint is on; zero if not a table constraint
</span>
この制約が存在しているテーブルです。テーブル制約でなければゼロです。
</p></td></tr><tr><td class="catalog_table_entry"><p class="column_definition">
<code class="structfield">contypid</code> <code class="type">oid</code>
<span class="original">
(references <link linkend="catalog-pg-type"><structname>pg_type</structname></link>.<structfield>oid</structfield>)
</span>
(参照先 <a class="link" href="catalog-pg-type.html" title="52.62. pg_type"><code class="structname">pg_type</code></a>.<code class="structfield">oid</code>)
</p>
<p>
<span class="original">
The domain this constraint is on; zero if not a domain constraint
</span>
この制約が存在しているドメインです。ドメイン制約でなければゼロです。
</p></td></tr><tr><td class="catalog_table_entry"><p class="column_definition">
<code class="structfield">conindid</code> <code class="type">oid</code>
<span class="original">
(references <link linkend="catalog-pg-class"><structname>pg_class</structname></link>.<structfield>oid</structfield>)
</span>
(参照先 <a class="link" href="catalog-pg-class.html" title="52.11. pg_class"><code class="structname">pg_class</code></a>.<code class="structfield">oid</code>)
</p>
<p>
<span class="original">
The index supporting this constraint, if it's a unique, primary
key, foreign key, or exclusion constraint; else zero
</span>
一意性制約、主キー制約、外部キー制約、排他制約の場合、この制約をサポートするインデックス。
さもなくばゼロ。
</p></td></tr><tr><td class="catalog_table_entry"><p class="column_definition">
<code class="structfield">conparentid</code> <code class="type">oid</code>
<span class="original">
(references <link linkend="catalog-pg-constraint"><structname>pg_constraint</structname></link>.<structfield>oid</structfield>)
</span>
(参照先 <a class="link" href="catalog-pg-constraint.html" title="52.13. pg_constraint"><code class="structname">pg_constraint</code></a>.<code class="structfield">oid</code>)
</p>
<p>
<span class="original">
The corresponding constraint of the parent partitioned table,
if this is a constraint on a partition; else zero
</span>
パーティション内の制約なら、親パーティションテーブルの該当制約、そうでなければゼロ。
</p></td></tr><tr><td class="catalog_table_entry"><p class="column_definition">
<code class="structfield">confrelid</code> <code class="type">oid</code>
<span class="original">
(references <link linkend="catalog-pg-class"><structname>pg_class</structname></link>.<structfield>oid</structfield>)
</span>
(参照先 <a class="link" href="catalog-pg-class.html" title="52.11. pg_class"><code class="structname">pg_class</code></a>.<code class="structfield">oid</code>)
</p>
<p>
<span class="original">
If a foreign key, the referenced table; else zero
</span>
外部キーであれば、参照されるテーブルです。そうでなければゼロです。
</p></td></tr><tr><td class="catalog_table_entry"><p class="column_definition">
<code class="structfield">confupdtype</code> <code class="type">char</code>
</p>
<p>
<span class="original">
Foreign key update action code:
<literal>a</literal> = no action,
<literal>r</literal> = restrict,
<literal>c</literal> = cascade,
<literal>n</literal> = set null,
<literal>d</literal> = set default
</span>
外部キー更新アクションコード:
<code class="literal">a</code> = no action,
<code class="literal">r</code> = restrict,
<code class="literal">c</code> = cascade,
<code class="literal">n</code> = set null,
<code class="literal">d</code> = set default
</p></td></tr><tr><td class="catalog_table_entry"><p class="column_definition">
<code class="structfield">confdeltype</code> <code class="type">char</code>
</p>
<p>
<span class="original">
Foreign key deletion action code:
<literal>a</literal> = no action,
<literal>r</literal> = restrict,
<literal>c</literal> = cascade,
<literal>n</literal> = set null,
<literal>d</literal> = set default
</span>
外部キー削除アクションコード:
<code class="literal">a</code> = no action,
<code class="literal">r</code> = restrict,
<code class="literal">c</code> = cascade,
<code class="literal">n</code> = set null,
<code class="literal">d</code> = set default
</p></td></tr><tr><td class="catalog_table_entry"><p class="column_definition">
<code class="structfield">confmatchtype</code> <code class="type">char</code>
</p>
<p>
<span class="original">
Foreign key match type:
<literal>f</literal> = full,
<literal>p</literal> = partial,
<literal>s</literal> = simple
</span>
外部キーの一致型:
<code class="literal">f</code> = full,
<code class="literal">p</code> = partial,
<code class="literal">s</code> = simple
</p></td></tr><tr><td class="catalog_table_entry"><p class="column_definition">
<code class="structfield">conislocal</code> <code class="type">bool</code>
</p>
<p>
<span class="original">
This constraint is defined locally for the relation. Note that a
constraint can be locally defined and inherited simultaneously.
</span>
この制約はリレーションでローカルに定義されています。制約はローカルに定義されていて同時に継承されます。
</p></td></tr><tr><td class="catalog_table_entry"><p class="column_definition">
<code class="structfield">coninhcount</code> <code class="type">int4</code>
</p>
<p>
<span class="original">
The number of direct inheritance ancestors this constraint has.
A constraint with
a nonzero number of ancestors cannot be dropped nor renamed.
</span>
この制約がもつ直系の先祖の数。
先祖の数がゼロではない制約は削除や改名はできません。
</p></td></tr><tr><td class="catalog_table_entry"><p class="column_definition">
<code class="structfield">connoinherit</code> <code class="type">bool</code>
</p>
<p>
<span class="original">
This constraint is defined locally for the relation. It is a
non-inheritable constraint.
</span>
この制約はリレーションのためにローカルで定義されます。これは非継承制約です。
</p></td></tr><tr><td class="catalog_table_entry"><p class="column_definition">
<code class="structfield">conkey</code> <code class="type">int2[]</code>
<span class="original">
(references <link linkend="catalog-pg-attribute"><structname>pg_attribute</structname></link>.<structfield>attnum</structfield>)
</span>
(参照先 <a class="link" href="catalog-pg-attribute.html" title="52.7. pg_attribute"><code class="structname">pg_attribute</code></a>.<code class="structfield">attnum</code>)
</p>
<p>
<span class="original">
If a table constraint (including foreign keys, but not constraint
triggers), list of the constrained columns
</span>
テーブル制約(外部キーを含みますが制約トリガは含みません)であれば、その制約によって制約される列のリスト
</p></td></tr><tr><td class="catalog_table_entry"><p class="column_definition">
<code class="structfield">confkey</code> <code class="type">int2[]</code>
<span class="original">
(references <link linkend="catalog-pg-attribute"><structname>pg_attribute</structname></link>.<structfield>attnum</structfield>)
</span>
(参照先 <a class="link" href="catalog-pg-attribute.html" title="52.7. pg_attribute"><code class="structname">pg_attribute</code></a>.<code class="structfield">attnum</code>)
</p>
<p>
<span class="original">
If a foreign key, list of the referenced columns
</span>
外部キーであれば、参照される列のリスト
</p></td></tr><tr><td class="catalog_table_entry"><p class="column_definition">
<code class="structfield">conpfeqop</code> <code class="type">oid[]</code>
<span class="original">
(references <link linkend="catalog-pg-operator"><structname>pg_operator</structname></link>.<structfield>oid</structfield>)
</span>
(参照先 <a class="link" href="catalog-pg-operator.html" title="52.34. pg_operator"><code class="structname">pg_operator</code></a>.<code class="structfield">oid</code>)
</p>
<p>
<span class="original">
If a foreign key, list of the equality operators for PK = FK comparisons
</span>
外部キーであれば、PK = FKの比較のための同値演算子のリスト
</p></td></tr><tr><td class="catalog_table_entry"><p class="column_definition">
<code class="structfield">conppeqop</code> <code class="type">oid[]</code>
<span class="original">
(references <link linkend="catalog-pg-operator"><structname>pg_operator</structname></link>.<structfield>oid</structfield>)
</span>
(参照先 <a class="link" href="catalog-pg-operator.html" title="52.34. pg_operator"><code class="structname">pg_operator</code></a>.<code class="structfield">oid</code>)
</p>
<p>
<span class="original">
If a foreign key, list of the equality operators for PK = PK comparisons
</span>
外部キーであれば、PK = PKの比較のための同値演算子のリスト
</p></td></tr><tr><td class="catalog_table_entry"><p class="column_definition">
<code class="structfield">conffeqop</code> <code class="type">oid[]</code>
<span class="original">
(references <link linkend="catalog-pg-operator"><structname>pg_operator</structname></link>.<structfield>oid</structfield>)
</span>
(参照先 <a class="link" href="catalog-pg-operator.html" title="52.34. pg_operator"><code class="structname">pg_operator</code></a>.<code class="structfield">oid</code>)
</p>
<p>
<span class="original">
If a foreign key, list of the equality operators for FK = FK comparisons
</span>
外部キーであれば、FK = FKの比較のための同値演算子のリスト
</p></td></tr><tr><td class="catalog_table_entry"><p class="column_definition">
<code class="structfield">conexclop</code> <code class="type">oid[]</code>
<span class="original">
(references <link linkend="catalog-pg-operator"><structname>pg_operator</structname></link>.<structfield>oid</structfield>)
</span>
(参照先 <a class="link" href="catalog-pg-operator.html" title="52.34. pg_operator"><code class="structname">pg_operator</code></a>.<code class="structfield">oid</code>)
</p>
<p>
<span class="original">
If an exclusion constraint, list of the per-column exclusion operators
</span>
排他制約の場合、列単位の排他演算子のリスト。
</p></td></tr><tr><td class="catalog_table_entry"><p class="column_definition">
<code class="structfield">conbin</code> <code class="type">pg_node_tree</code>
</p>
<p>
<span class="original">
If a check constraint, an internal representation of the
expression. (It's recommended to use
<function>pg_get_constraintdef()</function> to extract the definition of
a check constraint.)
</span>
チェック制約なら式の内部表現。(<code class="function">pg_get_constraintdef()</code>を使ってチェック制約の定義を取り出すことをお勧めします。)
</p></td></tr></tbody></table></div></div><br class="table-break" /><p>
<span class="original">
In the case of an exclusion constraint, <structfield>conkey</structfield>
is only useful for constraint elements that are simple column references.
For other cases, a zero appears in <structfield>conkey</structfield>
and the associated index must be consulted to discover the expression
that is constrained. (<structfield>conkey</structfield> thus has the
same contents as <link linkend="catalog-pg-index"><structname>pg_index</structname></link>.<structfield>indkey</structfield> for the
index.)
</span>
排他制約の場合、単純な列参照である制約要素でのみ<code class="structfield">conkey</code>が有用です。
その他の場合、<code class="structfield">conkey</code>はゼロであり、関連するインデックスは制約される式を調査して見つけなければなりません。
(したがってインデックスでは<code class="structfield">conkey</code>は<a class="link" href="catalog-pg-index.html" title="52.26. pg_index"><code class="structname">pg_index</code></a>.<code class="structfield">indkey</code>の内容と同じものを持ちます。)
</p><div class="note"><h3 class="title">注記</h3><p>
<span class="original">
<literal>pg_class.relchecks</literal> needs to agree with the
number of check-constraint entries found in this table for each
relation.
</span>
<code class="literal">pg_class.relchecks</code>はそれぞれのリレーションに対してこのテーブルで検出された検査制約の項目数と一致しなければなりません。
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