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<section id="domain-dialog">
<span id="id1"></span><h1><span class="target" id="index-0"></span>Domain Dialog<a class="headerlink" href="#domain-dialog" title="Link to this heading">¶</a></h1>
<p>Use the <em>Domain</em> dialog to define a domain. A domain is a data type definition
that may constrain permissible values. Domains are useful when you are creating
multiple tables that contain comparable columns; you can create a domain that
defines constraints that are common to the columns and re-use the domain
definition when creating the columns, rather than individually defining each
set of constraints.</p>
<p>The <em>Domain</em> dialog organizes the development of a domain through the following
tabs: <em>General</em>, <em>Definition</em>, <em>Constraints</em>, and <em>Security</em>. The <em>SQL</em> tab
displays the SQL code generated by dialog selections.</p>
<img alt="Domain dialog general tab" class="align-center" src="_images/domain_general.png" />
<p>Use the fields on the <em>General</em> tab to identify a domain:</p>
<ul class="simple">
<li><p>Use the <em>Name</em> field to add a descriptive name for the domain. The name will
be displayed in the <em>pgAdmin</em> tree control.</p></li>
<li><p>Use the drop-down listbox next to <em>Owner</em> to select a role that will own the
domain.</p></li>
<li><p>Select the name of the schema in which the domain will reside from the
drop-down listbox in the <em>Schema</em> field.</p></li>
<li><p>Store notes about the domain in the <em>Comment</em> field.</p></li>
</ul>
<p>Click the <em>Definition</em> tab to continue.</p>
<img alt="Domain dialog definition tab" class="align-center" src="_images/domain_definition.png" />
<p>Use the fields in the <em>Definition</em> tab to describe the domain:</p>
<ul class="simple">
<li><p>Use the drop-down listbox next to <em>Base type</em> to specify a data type.</p></li>
<li><p>Use the context-sensitive <em>Length</em> field to specify a numeric length for a
numeric type.</p></li>
<li><p>Use the context-sensitive <em>Precision</em> field to specify the total count of
significant digits for a numeric type.</p></li>
<li><p>Specify a default value for the domain data type in the <em>Default</em> field. The
data type of the default expression must match the data type of the domain. If
no default value is specified, then the default value is the null value.</p></li>
<li><p>Move the <em>Not Null</em> switch to specify the values of this domain are prevented
from being null.</p></li>
<li><p>Use the drop-down listbox next to <em>Collation</em> to apply a collation cast. If
no collation is specified, the underlying data type’s default collation is
used. The underlying type must be collatable if COLLATE is specified.</p></li>
</ul>
<p>Click the <em>Constraints</em> tab to continue.</p>
<img alt="Domain dialog constraints tab" class="align-center" src="_images/domain_constraints.png" />
<p>Use the fields in the <em>Constraints</em> tab to specify rules for the domain. Click
the <em>Add</em> icon (+) to set constraints:</p>
<ul class="simple">
<li><p>Use the <em>Name</em> field to specify a name for the constraint.</p></li>
<li><p>Use the <em>Check</em> field to provide an expression for the constraint.</p></li>
<li><p>Use the <em>Validate</em> checkbox to determine whether the constraint will be
validated. The default checkbox is checked and sets a validation requirement.</p></li>
</ul>
<p>A CHECK clause specifies an integrity test which values of the domain must
satisfy. Each constraint must be an expression that produces a Boolean result.
Use the key word VALUE to refer to the value being tested. Expressions
evaluating to TRUE or UNKNOWN succeed. If the expression produces a FALSE
result, an error is reported and the value is not allowed to be converted to
the domain type. A CHECK expression cannot contain subqueries nor refer to
variables other than VALUE. If a domain has multiple CHECK constraints, they
will be tested in alphabetical order by name.</p>
<p>Click the <em>Add</em> icon (+) to set additional constraints; to discard a constraint,
click the trash icon to the left of the row and confirm deletion in the <em>Delete
Row</em> popup.</p>
<p>Click the <em>Security</em> tab to continue.</p>
<img alt="Domain dialog security tab" class="align-center" src="_images/domain_security.png" />
<p>Use the <em>Security Labels</em> panel to assign security labels. Click the <em>Add</em> icon
(+) to add a label:</p>
<ul class="simple">
<li><p>Specify a security label provider in the <em>Provider</em> field. The named provider
must be loaded and must consent to the proposed labeling operation.</p></li>
<li><p>Specify a a security label in the <em>Security Label</em> field. The meaning of a
given label is at the discretion of the label provider. PostgreSQL places no
restrictions on whether or how a label provider must interpret security
labels; it merely provides a mechanism for storing them.</p></li>
</ul>
<p>Click the <em>Add</em> icon (+) to specify each additional label; to discard a label,
click the trash icon to the left of the row and confirm deletion in the <em>Delete
Row</em> popup.</p>
<p>Click the <em>SQL</em> tab to continue.</p>
<p>Your entries in the <em>Domain</em> dialog generate a SQL command (see an example
below). Use the <em>SQL</em> tab for review; revisit or switch tabs to make any changes
to the SQL command.</p>
<section id="example">
<h2>Example<a class="headerlink" href="#example" title="Link to this heading">¶</a></h2>
<p>The following is an example of the sql command generated by selections made in
the <em>Domain</em> dialog:</p>
<img alt="Domain dialog sql tab" class="align-center" src="_images/domain_sql.png" />
<p>The example shown demonstrates creating a domain named <em>postal_code</em> that
confirms that the value entered is in proper format.</p>
<ul class="simple">
<li><p>Click the <em>Info</em> button (i) to access online help.</p></li>
<li><p>Click the <em>Save</em> button to save work.</p></li>
<li><p>Click the <em>Close</em> button to exit without saving work.</p></li>
<li><p>Click the <em>Reset</em> button to restore configuration parameters.</p></li>
</ul>
</section>
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<h3><a href="index.html">Table of Contents</a></h3>
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<li><a class="reference internal" href="#">Domain Dialog</a><ul>
<li><a class="reference internal" href="#example">Example</a></li>
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<h3><a href="index.html">Table of Contents</a></h3>
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<li class="toctree-l1"><a class="reference internal" href="getting_started.html">Getting Started</a></li>
<li class="toctree-l1"><a class="reference internal" href="external_database.html">External database for pgAdmin user settings</a></li>
<li class="toctree-l1"><a class="reference internal" href="connecting.html">Connecting To A Server</a></li>
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<li class="toctree-l2"><a class="reference internal" href="dbms_job_scheduler.html">Using EDB Job Scheduler</a></li>
<li class="toctree-l2"><a class="reference internal" href="collation_dialog.html">Collation Dialog</a></li>
<li class="toctree-l2 current"><a class="current reference internal" href="#">Domain Dialog</a></li>
<li class="toctree-l2"><a class="reference internal" href="domain_constraint_dialog.html">Domain Constraints Dialog</a></li>
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