Given the relation above, the invalid relational algebra is:
D. II, (R x S)
What is relational algebra?
Relational algebra is a sort of mathematical expression that is characterized by procedural language and some signs and symbols that make it easier to work it.
There are signs that indicate unions, intersections, renaming, and differences. Given the set above, the invalid relational algebra will be option C. This is because the expression does not fall under the category of standard relational algebra denotations.
Complete Question:
Given R=(x,y,z), S=(x,w,u) The following is an invalid Relational Algebra expression:
O A. II,(R - S)
O B. (IIz(R) N II, (S)) - R
O c. Ily,w(Px=27 (R) Pr22 (S))
OD. II, (R x S)
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