(iii) Introduction to SQL Getting Started database normalization

What is the normalization of the database, plainly, is to remove the database redundancy, in order to make the database easier to manage and the large table logically divided into small table process.

What is the normalization of the database is the opposite of normalization. Then you may ask, since the above says that the normalization of the database is good, why to normalize it? This is because the normalization of the database, resulting in a result, the user in the search for data, may need to correlate multiple tables, in order to complete the data query, which reduces the data query speed, performance is not very good, so sometimes, in order to performance, we can make some concessions on the normalization of the database.

(iii) Introduction to SQL Getting Started database normalization