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A table s primary key must have a unique value for each row of the table, or the database will lose its integrity as a model of the outside world. For example, if two rows of the SALESREPS table both had value 106 in their EMPL_NUM column, it would be impossible to tell which row really represented the real-world entity associated with that key value Bill Adams, who is employee number 106. For this reason, the requirement that primary keys have unique values is called the entity integrity constraint. The first commercial SQL databases did not support primary keys, but support is now common. It was added to DB2 in 1988 and was added to the original ANSI/ISO SQL standard in an intermediate update, before the full SQL2 standard appeared. You specify the primary key as part of the CREATE TABLE or ALTER TABLE statement, described in 13. The sample database definition in Appendix A includes primary key definitions for all of its tables, following the ANSI/ISO standard syntax. When a primary key is specified for a table, the DBMS automatically checks the uniqueness of the primary key value for every INSERT and UPDATE statement performed on the table. An attempt to insert a row with a duplicate primary key value or to update a row so that its primary key would be a duplicate will fail with an error message.

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It is sometimes appropriate to require a column that is not the primary key of a table to contain a unique value in every row For example, suppose you wanted to restrict the data in the SALESREPS table so that no two salespeople could have exactly the same name in the table You could achieve this goal by imposing a uniqueness constraint on the NAME column The DBMS enforces a uniqueness constraint in the same way that it enforces the primary key constraint Any attempt to insert or update a row in the table that violates the uniqueness constraint will fail While both uniqueness and primary key constraints prevent duplicate values from appearing in a set of columns in a table, there are two fundamental differences: A table may have only one primary key constraint defined on it, while a table can have any number of unique constraints defined.

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Columns named in a primary key constraint must be defined as NOT NULL, while columns included in a unique constraint may be defined as either NULL or NOT NULL The ANSI/ISO SQL standard uses the CREATE TABLE and ALTER TABLE statements to specify uniqueness constraints for columns or combinations of columns However, uniqueness constraints were implemented in DB2 long before the publication of the ANSI/ ISO standard, and DB2 made them a part of its CREATE INDEX statement This statement is one of the SQL database administration statements that deals with physical storage of the database on the disk Normally, the SQL user doesn t have to worry about these statements at all; they are used only by the database administrator Many commercial SQL products followed the original DB2 practice rather than the ANSI/ISO standard for uniqueness constraints and required the use of a CREATE INDEX statement.

28.1 PERMISSIBLE STRESSES AND STRAINS / 28.4 28.2 THEORY OF STATIC FAILURE / 28.5 28.3 STRESS CONCENTRATION / 28.9 28.4 FRACTURE MECHANICS / 28.13 28.5 NONFERROUS METALS / 28.19 REFERENCES / 28.22

During the lecture, you can pause and ask for more detail on particular issues, or skip over parts of the lecture in which you have already established confidence Indeed, if the sidebar information appeals, you may explore that information for a while, following links to more detailed information, before returning to the main lecture In this way, the lecture can also be a tutorial and examination in one, with the feel of being more like a discussion with a world expert, than a dryly delivered, dogmatic, didactic lecture Parts of the streaming tutorial can be synchronized with other applications or media, to illustrate the concepts under discussion more richly and thus assist the student in assimilating the knowledge If there is a live lecture in progress, individual students can pose questions directly to the expert, redirecting the flow of the lesson in order to get the information required.

Subsequent versions of DB2 added a uniqueness constraint to the CREATE TABLE and ALTER TABLE statements Most of the other commercial vendors have followed the same path and now support the ANSI/ISO syntax for the uniqueness constraint..

a A D, d F I J K K Kc Kt Kts M n qs Crack semilength Area Diameter Force or load Second moment of area Second polar moment of area Stress-intensity factor Stress-concentration factor for static loading Critical-stress-intensity factor Normal-stress-concentration factor Shear-stress-concentration factor Moment Design factor Sensitivity index

Part III:

28.3 Downloaded from Digital Engineering Library @ McGraw-Hill (www.digitalengineeringlibrary.com) Copyright 2004 The McGraw-Hill Companies. All rights reserved. Any use is subject to the Terms of Use as given at the website.