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| <section id="cast-dialog">
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| <span id="id1"></span><h1><span class="target" id="index-0"></span>Cast Dialog<a class="headerlink" href="#cast-dialog" title="Link to this heading">¶</a></h1>
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| <p>Use the <em>Cast</em> dialog to define a cast. A cast specifies how to convert a value
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| from one data type to another.</p>
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| <p>The <em>Cast</em> dialog organizes the development of a cast through the following
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| dialog tabs: <em>General</em> and <em>Definition</em>. The <em>SQL</em> tab displays the SQL code
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| generated by dialog selections.</p>
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| <img alt="Cast dialog general tab" class="align-center" src="_images/cast_general.png" />
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| <p>Use the fields in the <em>General</em> tab to identify the cast:</p>
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| <ul class="simple">
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| <li><p>The <em>Name</em> field is disabled. The name that will be displayed in the
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| <em>pgAdmin</em> tree control is the <em>Source</em> type concatenated with the <em>Target</em>
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| type, and is generated automatically when you make selections on the <em>Cast</em>
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| dialog <em>Definition</em> tab.</p></li>
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| <li><p>Store notes about the cast 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="Cast dialog definition tab" class="align-center" src="_images/cast_definition.png" />
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| <p>Use the fields in the <em>Definition</em> tab to define parameters:</p>
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| <ul class="simple">
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| <li><p>Use the drop-down listbox next to <em>Source type</em> to select the name of the
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| source data type of the cast.</p></li>
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| <li><p>Use the drop-down listbox next to <em>Target type</em> to select the name of the
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| target data type of the cast.</p></li>
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| <li><p>Use the drop-down listbox next to <em>Function</em> to select the function used to
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| perform the cast. The function’s result data type must match the target type
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| of the cast.</p></li>
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| <li><p>Select <em>Context</em> toggle to <em>Implicit</em> if the cast is implicit.
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| By default, a cast can be invoked only by an explicit cast request. If the
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| cast is marked <em>Implicit</em> then it can be invoked implicitly in any context,
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| whether by assignment or internally in an expression.</p></li>
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| </ul>
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| <p>Click the <em>SQL</em> tab to continue.</p>
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| <p>Your entries in the <em>Cast</em> dialog generate a SQL command (see an example below).
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| Use the <em>SQL</em> tab for review; revisit or switch tabs to make any changes to the
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| SQL command.</p>
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| <p><strong>Example</strong></p>
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| <p>The following is an example of the sql command generated by user selections in
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| the <em>Cast</em> dialog:</p>
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| <img alt="Cast dialog sql tab" class="align-center" src="_images/cast_sql.png" />
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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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