#include <fstream>
#include <iostream>
#include <vector>
#include "Relation.h"
using namespace std;
class DBEngine {
//member variables
//NOT DONE
//vector<Relation> tables;
public:
DBEngine();
void createCmd();
//void openCmd();
void saveCmd();
void showCmd();
void insertQuery();
void deleteQuery();
void selectQuery();
void projectQuery();
void productQuery();
bool unionComp();
};