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Choose the correct set of replacements for operation ⊕  for which following equivalence relation holds:
                                         σθ(E1⊕E2)≡σθ(E1)⊕E2

1. Union only    
 
2. Union and Intersection
 
3. Intersection and Set Difference
 
4. Intersection and Union
in Databases by (249 points) | 410 views

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