diff --git a/DBEngine.h b/DBEngine.h
index 8a71981..d5ae85a 100755
--- a/DBEngine.h
+++ b/DBEngine.h
@@ -1,3 +1,4 @@
+#pragma once
 #include <fstream>
 #include <iostream>
 #include <vector>
@@ -6,8 +7,9 @@
 //still in progress
 class DBEngine{
 	vector<Relation> tables;
+	vector<string> commands;
 	int size;
-
+	
 public:
 	DBEngine();
 	void createTable(string n);
@@ -17,10 +19,13 @@ public:
 	//void showTable(Relation r);
 	Relation& getTableFromName(string n);
 	void saveToFile(vector<string> cmds);
-	//Relation selection();
+	Relation selection(string attName, string s, Relation r);
 	Relation projection(vector<string> input, Relation r);
+	Relation product(string s1, Relation r1, Relation r2);
 	void rename(Relation& r, vector<string> oldnames, vector<string> newnames);
-	//void setUnion();
+	void save();
+	void storeCommands(string s);
+	//Relation setUnion(Relation r1, Relation r2);
 	//void setDiff();
-	//void crossProduct();
+	//void crossProduct();
 };