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if E1 and E2 are relational algebra expressions then which of the following is NOT a relational algebra expression

(a) E1 U E2

(b) E1 X E2

(c) E1 - E2

(d) E1 / E2
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Relational algebra has $6$ basic relational operation.

  1. Select $(\sigma )$
  2. Project $(\pi )$
  3. Union $(\cup )$
  4. Set difference$(-)$
  5. Cartisian product $(\times )$
  6. Rename $(\rho )$

Other Operations like Divide $(/)$ can be derived using the basic 6 operators.

So,Only option (D) has derived operator , So Correct answer is option (D).

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