kotlin/-string/index.html"><span class="identifier">String</span></a><span class="symbol">?</span>&nbsp;<span class="symbol">=</span>&nbsp;null<span class="symbol">)</span><span class="symbol">: </span><a href="https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-unit/index.html"><span class="identifier">Unit</span></a></code>
<p>Add new boolean column to existing table.</p>
<p>In PostgreSQL, BOOLEAN column will be added.
In MySQL, TINYINT column will be added.</p>
<h3>Parameters</h3>
<p><a name="tableName"