For any reason if you need the MySQL table’s columns name in WordPress then use below code.
global $wpdb;
$table = $wpdb->prefix . 'table_name';
$column = $wpdb->get_col( "DESC " . $table, 0 );
Now you have the all columns of the table $column array. Print those
foreach( $column as $key => $value ) {
echo $value;
}