/**
 * Initialize a query builder to perform a MIN query on the database
 *
 * @param string $table The table name
 * @param string $field The field name to find min
 * @param string $alias The optional field alias; defaults to "min"
 *
 * @return object QueryBuilder
 */
function db_min($table, $field, $alias = null)
{
    $qb = new QueryBuilder($table);
    return $qb->min($field, $alias ? $alias : 'min');
}