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>The PK is not supposed to be visible or meaningful to the user. Not only that, but if you use order# + line # as the primary key in the line items table, you will have to do substring manipulations and/or cascade updates when the user changes the order #. This is even worse with a grand-child table. With a meaningless PK, there will be no need for such cascade updates.
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In my app the user can NEVER change the order number, it is assigned by the application.
"The creative process is nothing but a series of crises." Isaac Bashevis Singer
"My experience is that as soon as people are old enough to know better, they don't know anything at all." Oscar Wilde
"If a nation values anything more than freedom, it will lose its freedom; and the irony of it is that if it is comfort or money that it values more, it will lose that too." W.Somerset Maugham
