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