se, then the insert or update will abort</li>
<li>otherwise, it will succeed</li>
<li>be careful: if the expression evaluates to <code>null</code>, then the insert or update will succeed</li>
</ul></li>
<li>If the check constraints refers to only 1 column, it can be specified as a column constraint
<ul>
<li><code>score integer check(score &gt;= 0 and score &lt;= 100)</code></li>
</ul></li>
<li>If the check constraints refers to 2 or more columns, it must be specified as a table constraint
<ul>
<li><code>che