Converting each of the forms of to relational algebra

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Give a rule for converting each of the following forms of to relational algebra. All conditions may be assumed to be applied (by a two-argument selection) to a relation R. You may assume that the subquery is not correlated with R. Be careful that you do not introduce or eliminate duplicates in opposition to the formal definition of SQL.

a) A condition of the form EXISTS ().

b) A condition of the form a - ANY , where a is an attribute of R.

c) A condition of the form a - ALL , where a is an attribute of R.

Reference no: EM131212776

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