May 2020
Beginner
564 pages
14h 9m
English
Content preview from Learn SQL Database Programming
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The first normal form
The first normal form (1NF) is the first level of database normalization. You will need to complete this step before proceeding to other database normalization forms. The primary reason to implement 1NF is to eliminate repeating groups. This ensures that you can use simple SQL statements to query the data. It also ensures that you aren't duplicating data, which uses additional storage and computing time. This step will ensure that you are doing the following:
- Defining data, columns, and data types and putting related data into columns
- Eliminating repeating groups of data:
- This means that you will not have repeating columns, such as Year1, Year2, Year3, but instead will have a column that is named Year, and each row ...
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