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  Tutorial: PHP Database Related Data Integrity Using MySQL and PHP (Part 2) Tutorial

A continuation of the series, 'Data Integrity Using MySQL and PHP,' this article discusses the concept of auto_increment fields in MySQL, to cause MySQL to store a unique, incrementing integer in the field of each new row.

Tutorial Details:

Data Integrity Using MySQL and PHP (Part 2)

In the first installment in this series we discussed the use of PRIMARY KEYS to prevent duplicate entries in a table. We created the "employee" table.

Another approach is to create an "artificial" primary key that doesn't have anything to do with the data you're interested in, but is guarenteed to be unique. Many databases use this approach because it doesn't restrict the data to be stored, but ensures that any row in a table is distinctly retrievable.

MySQL supports a special column option called "auto_increment" which may be applied to integer columns, and causes MySQL to store a unique, incrementing integer in that field of each new row. In effect MySQL is generating a unique record Id for each row you insert.


 

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