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Q: What is the expression for the extension of a relation on the operation select?
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Where are the function of selection and projection operation?

The Selection Operation is used to select a subset of the tuples (records) from a relation (file) that satisfy a selection condition.If we think of a relation as a table, the select operation select some of the Rows from the table while discarding other Rows. The Projection select certain column from the table and discarding the other columns.The result of the Projection operation can hence be visualized as a vertical partition of the relation into two relations, one has needed columns (attributes) & contain the result of the operations & the other contains in the discarded column.Binamani BoroGuwahati


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