Let R (A, B, C) be a relation schema. What happens if we execute the following...

  

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Let R (A, B, C) be a relation schema. What happens if we execute the following query? SELECT* FROM R WHERE A=D; Select one: a. The query executes successfully but returns no tuples. b. We get an error. c. The query returns all the tuples in R. Let R (A, B, C) be a relation schema. What happens if we execute the following query? SELECT* FROM R WHERE A=D; Select one: a. The query executes successfully but returns no tuples. b. We get an error. c. The query returns all the tuples in R.

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