3 - Trees in polyhedral maps by Barnette D. W.

By Barnette D. W.

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Be careful, though, and find out whether your SQL product will check the existing data to be sure that it can pass the new constraint. It is possible in some older SQL products to leave bad data in the tables, and then you will have to clean them out with special routines to get to the actual physical storage. The DROP CONSTRAINT clause requires that the constraint be given a name, so naming constraints is a good habit to get into. If the constraint to be dropped was given no name, you will have to find what name the SQL engine assigned to it in the schema information tables and use that name.

CREATE TABLE Playgirls (boy_name VARCHAR(30) NOT NULL UNIQUE -- nested key REFERENCES Boys (boy_name) ON UPDATE CASCADE ON DELETE CASCADE, girl_name VARCHAR(30) NOT NULL, REFERENCES Girls(girl_name) ON UPDATE CASCADE ON DELETE CASCADE, PRIMARY KEY (boy_name, girl_name)); -- compound key The Playgirls table would permit these rows from our original set. ('Joe Celko', 'Lindsay Lohan') ('Toby McGuire', 'Lindsay Lohan') Think about all of these possible keys for a minute. The compound PRIMARY KEY is now redundant.

DEFAULT Clause The default clause is an underused feature, whose syntax is: ::= [CONSTRAINT ] DEFAULT ::= | | NULL 10 CHAPTER 1: DATABASE DESIGN ::= CURRENT_DATE | CURRENT_TIME | CURRENT_TIMESTAMP | SYSTEM_USER | SESSION_USER | CURRENT_USER The SQL 2003 Standard also added CURRENT_PATH and . Whenever the SQL engine does not have an explicit value to put into this column during an insertion, it will look for a DEFAULT clause and insert that value.

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