ode> table</li>
</ul></li>
<li>But we cannot insert a new row in the employee view because the <code>employee_priv</code> table has the SIN column, which cannot be <code>null</code>
<ul>
<li>also, since it has the <code>unique</code> constraint, we cannot set it to a default value
<ul>
<li>actually, we could set it to a default value for at most 1 employee</li>
</ul></li>
</ul></li>
<li>Similarly, trying to update the <code>studentcourse</code> view could be complicated because it comes from the join of 4 t