“Primary keys,” “foreign keys"…what are they talking about?
And “Boyce-Codd normal form” sounds like a disease.
The links you create ensure you don’t forget how the data is related, and they remind you to enter (and prevent you from accidentally deleting) data that’s needed to complete the picture.
Using bind variables makes the statement reusable with different input values.
Using bind variables also improves query performance in the database, eliminates the need for special handling of literal quotation marks in the input, and protects against SQL injection attacks.
Normalizing is all about splitting up your tables the right way—but once they’re split, you need a way to connect them.
For instance, if you create a separate table for orders, you need a way to track which orders go with which customers.
Then we’ll help you ensure that the data that goes into your lovely design is valid.
Finally, we’ll address the myriad migraines that Access causes when you try to move data around using import, export, and linking.: I’ve heard that I’m supposed to “normalize” my tables, but the books that discuss this are really confusing.
The objective is to isolate data so that additions, deletions, and modifications of a field can be made in just one table and then propagated through the rest of the database via the defined relationships.”Such well-designed tables are essential to maintaining data integrity and the long-term health of your database.
They also make a big difference in performance as your database grows.
It provides data you can experiment with and database objects that demonstrate features you might want to implement in your own databases.""The Northwind sample database (Northwind.mdb) is included with all versions of Access.