Variables, Assignments, and Operators
Data types in PL/SQL include all SQL data types and subtypes qualified in Table D-1, plus there are five PL/SQL specific data types covered in Table E-1. There are a number of implicit casting operations performed by Oracle, and they generally follow the common rule of programming: cast implicitly when there is no loss of precision. A loss of precision does occur when Oracle casts real numbers to integers, where it truncates the decimal portion of the number. Likewise, there are a series of functions to let you cast explicitly when there is risk of losing runtime precision. You should choose carefully when you explicitly downcast variables.
There are several other product-specific types created to support ...
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