public function dropForeignKey($tableName, $schemaName, $referenceName)
    {
        return $this->dialect->dropForeignKey($tableName, $schemaName, $referenceName);
    }
public function dropForeignKey($tableName, $schemaName, $referenceName)
    {
        return $this->dialect->dropForeignKey($tableName, $schemaName, $referenceName);
    }
public function dropForeignKey ( $ tableName , $ schemaName , $ referenceName ) { return $ this -> dialect -> dropForeignKey ( $ tableName , $ schemaName , $ referenceName ) ; }
Generates SQL to delete a foreign key from a table

@param string $tableName
@param string $schemaName
@param string $referenceName

@return string
Generates SQL to delete a foreign key from a table