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A line of PL/SQL text contains groups of characters known as

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A line of PL/SQL text contains groups of characters known as (a) Lexical Units (b) Literals (c) Textual Units (d) Identifiers The question was asked in homework. I need to ask this question from Advanced Query Optimization in portion Query Processing Techniques of Database Management

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The correct answer is (a) Lexical Units The explanation is: Lexical items can be generally understood to convey a single meaning, much as a lexeme, but are not limited to single words.

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