Definition of the natural join operator based on K

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Reference no: EM133940734

Questions

1. Consider tables T1(I,J,K) and T2(K,L,M) with all integer columns. Write the fundamental relational algebra definition of the natural join operator based on K (i.e the most common) based on a cartesian product (i.e not using the "infinity" symbol). Extra: with SQL queries, but making there is a cartesian product ( hint: inefficient ).

2. Consider relational operators "union of two sets", "intersection of two sets", "x", "Pi","o","infinite" and tables with a valid primary key (i.e sets). Which operators may produce duplicate during query evaluation in intermediate tables in SQL? Explain why. Extra: Show SQL query examples for the operators you listed, with and without duplicates, based on these simple tables: T1(A,B) and T2(C,D), where all columns are integers.

Reference no: EM133940734

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