New PDF release: Beginning Visual Basic. NET databases

By Denise Gosnell; Matthew Reynolds; Bill Forgey

ISBN-10: 1861005555

ISBN-13: 9781861005557

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We'll take a look at what each of these means in more detail. 26 Relational Database Design Unique indexes are indexes that do not allow duplicate records. Unique indexes are typically used for the primary keys of a table. Conversely, non-unique indexes are indexes on fields that do allow duplicate values (typically fields that need to be indexed for speed, such as foreign keys, but are not the primary key). With clustered indexes, the data is physically stored in the table in the same order as the clustered index.

This means that for each role, there can be many users. Further notice how there is a one-to-many relationship between the Users and UsersRoles tables. This means that each user can have many roles. You can see how the intermediate table, UserRoles, brings these two tables together. A good way of thinking of it is that the UsersRoles is a bride table which brings the Roles and Users tables together. The diagram below shows some sample data to further illustrate this concept: Notice that in the UsersRoles table, the user jdoe is assigned the RoleIds of 2 and 5.

Indexes in a database are similar to indexes in a book – they allow rapid location of required information. Indexes are important to good database design, because all of the data in the world wouldn't be much good without a means to quickly retrieve it. The database engine uses indexes to rapidly locate one particular piece of information, but the database engine doesn't contain indexes unless you explicitly set them up. So, what are the types of indexes available to us, and when should each be used?

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Beginning Visual Basic. NET databases by Denise Gosnell; Matthew Reynolds; Bill Forgey


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