October 1997
Intermediate to advanced
1312 pages
38h 56m
English
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Working with Relations, Key Fields, and Indexes
Your final tasks before adding records to the Personnel Actions table are to determine the relationship between Personnel Actions and an existing table in the database, assign a primary-key field, and add indexes to your table.
Establishing Relationships Between Tables
Relationships between existing tables and your new table determine the field used as the new table's primary key. The following four possibilities exist for relationships between tables:
One-to-one relationships require that the key field's value in only one record in your new table matches a single corresponding value of the related field in the existing table. In this case, the key field in your new table must be unique; duplicate ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.