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| <span id="id1"></span><h1><span class="target" id="index-0"></span>Check Dialog<a class="headerlink" href="#check-dialog" title="Link to this heading">¶</a></h1>
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| <p>Use the <em>Check</em> dialog to define or modify a check constraint. A check
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| constraint specifies an expression that produces a Boolean result that new or
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| updated rows must satisfy for an insert or update operation to succeed.</p>
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| <p>The <em>Check</em> dialog organizes the development of a check constraint through the
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| <em>General</em> and <em>Definition</em> tabs. The <em>SQL</em> tab displays the SQL code generated
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| by dialog selections.</p>
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| <img alt="Check dialog general tab" class="align-center" src="_images/check_general.png" />
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| <p>Use the fields in the <em>General</em> tab to identify the check constraint:</p>
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| <ul class="simple">
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| <li><p>Use the <em>Name</em> field to provide a descriptive name for the check constraint
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| that will be displayed in the <em>pgAdmin</em> tree control. With PostgreSQL 9.5
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| forward, when a table has multiple check constraints, they will be tested for
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| each row in alphabetical order by name and after NOT NULL constraints.</p></li>
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| <li><p>Store notes about the check constraint 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="Check dialog definition tab" class="align-center" src="_images/check_definition.png" />
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| <p>Use the fields in the <em>Definition</em> tab to define the check constraint:</p>
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| <ul class="simple">
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| <li><p>Provide the expression that a row must satisfy in the <em>Check</em> field.</p></li>
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| <li><p>Move the <em>No Inherit?</em> switch to the <em>Yes</em> position to specify that this
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| constraint is not automatically inherited by a table’s children. The default
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| is <em>No</em>, meaning that the constraint will be inherited by any children.</p></li>
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| <li><p>Move the <em>Don’t validate?</em> switch to the <em>No</em> position to skip validation of
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| existing data; the constraint may not hold for all rows in the table. The
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| default is <em>Yes</em>.</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>Check</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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| <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>Check</em> dialog:</p>
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| <img alt="Check dialog sql tab" class="align-center" src="_images/check_sql.png" />
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| <p>The example shown demonstrates creating a check constraint named <em>jobhist_date_chk</em>
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| on the <em>startdate</em> column of the <em>jobhist</em> table.</p>
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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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