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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')
IS_DIGITS (SUBSTRING(C, 1)))
} ;
Query: SELECT * FROM EMPLOYEE1; Select 5 columns and all rows from one table Query: SELECT C_ID, COMPANY, BUILDING, DEPARTMENT, BRANCH FROM CONTRACT;
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