Data types and representations, PL-SQL Programming

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Data Types and Representations

This explains the concept possible representation, abbreviated possrep, and explains how these can be used in conjunction with constraints to define types.

Example: A Type Definition

TYPE SID POSSREP SID {C CHAR

CONSTRAINT LENGTH(C) <= 5

AND

STARTS_WITH(C, 'S')

AND

IS_DIGITS (SUBSTRING(C, 1)))

} ;

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