framework/db/QueryBuilder.php
public function dropPrimaryKey($name, $table)
    {
        return 'ALTER TABLE ' . $this->db->quoteTableName($table)
            . ' DROP CONSTRAINT ' . $this->db->quoteColumnName($name);
    }
public function dropPrimaryKey($name, $table)
    {
        return 'ALTER TABLE ' . $this->db->quoteTableName($table)
            . ' DROP CONSTRAINT ' . $this->db->quoteColumnName($name);
    }
Builds a SQL statement for removing a primary key constraint to an existing table.
@param string $name the name of the primary key constraint to be removed.
@param string $table the table that the primary key constraint will be removed from.
@return string the SQL statement for removing a primary key constraint from an existing table.