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Third Step at defining type SID in SQL
CREATE DOMAIN SID AS VARCHAR(5)
CHECK ( VALUE IS NOT NULL AND
SUBSTRING(VALUE FROM 1 FOR 1) = 'S' AND
CAST('+'||SUBSTRING(VALUE FROM 2) AS INTEGER) >= 0 );
Explanation:
Hi,am developing a library system and relating all the table is somehow complex,could you kindly assist me
Relational Operators The relational operators permit you to compare randomly complex expressions. The list below provides the meaning of each operator:
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