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In SQL the statement $\text{select * from R, S}$ is equivalent to

  1. $\text{select * from R natural join S}$
  2. $\text{select * from R cross join S}$
  3. $\text{select * from R outer join S}$
  4. $\text{select * from R inner join S}$
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By default, SQL performs cross product when no join is specified.

Hence the correct answer will be Option $(B)$ : select * from R cross join S

 

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