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Pictorial representation of an expression is called

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Pictorial representation of an expression is called

(a) Expression tree

(b) Operator tree

(c) Expression flow

(d) Expression chart

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This intriguing question comes from Evaluation of Expressions in portion Query Processing Techniques of Database Management

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Right option is (b) Operator tree

To explain: The operator tree has a tree like format where the evaluation starts from root of the tree.

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