2. Middle-level --- PL/SQL
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fill the gap between the highest SQL level and lowest C level programming.
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It is basically a procedual implementation of SQL access.
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Pure SQL is a subset of PL/SQL where more C-like constructs are introduced
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Such as block-structure,control statments, variables,module,interface specification,functions, etc).
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But it doesnt have the rich data-types and low-level operators as in C such as
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Structure(record),enumeration,array, pointer(reference), and set datatypes, and bitwise-operator,I/O and file handling.
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