Multiple choice technology databases

What are the notations used for writing SQL language

  1. OMEGA

  2. RHO

  3. DELTA

  4. PIE

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B,D Correct answer
Explanation

This appears to reference formal language notations. RHO and PIE (possibly Pi calculus) are theoretical notations used in formal language theory and database theory, while OMEGA and DELTA are not standard SQL notations.