There is a DISTINCT operator in SQL. However, I have an assignment in which I need to get some distinct values from a table, and I can only use relational algebra. Is there a way?
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There is a DISTINCT operator in SQL. However, I have an assignment in which I need to get some distinct values from a table, and I can only use relational algebra. Is there a way?
Relational operators always return distinct tuples so DISTINCT is never needed. Duplicate tuples are not permitted in the RA – that being one major difference between the relational model and the SQL model.