Update DBEngine.h
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@ -20,6 +20,7 @@ public:
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void saveToFile(vector<string> cmds);
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Relation selection(string attName, string s, Relation r);
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Relation projection(vector<string> input, Relation r);
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Relation product(string s1, Relation r1, Relation r2);
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void rename(Relation& r, vector<string> oldnames, vector<string> newnames);
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Relation setUnion(Relation r1, Relation r2);
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//void setDiff();
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