access+courses+in+london - What is the 1st normal form ?

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Tue 27 Feb 2007, 10:01 Delegate Simon said...

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What is the 1st normal form ?

Mon 5 Mar 2007, 16:08 Trainer Carlos said...

RE: What is the 1st normal form ?

First Normal Form (1NF) sets the very basic rules for an organized database:

A table in 1NF:

Does not contain similar information in several fields

Does not contain fields in which the values can be further broken down into smaller parts eg. A field called Name can be broken down into FirstName and Last name.

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Access tip:

Deleting duplicate records from a table

You cannot delete records tables where there duplicate records. A way around this is to create a new table which wont hold the duplicates. and then deleting the old table.

1. Use a make-table query based on this table only. IMPORTANT - Ensure that you include all of the fields from your original table or you may loose data.

2. Open the query's property sheet by using VIEW, QUERY, PROPERTIES, and set the Unique Values property to Yes

3. Because you have selected the Unique Values to Yes when you run the query, Access creates a new table without duplicate records. You can now delete the old table and rename the new one.

View all Access hints and tips