INT(8) in MySQL: Display Width or Value Range?

Decoding the Mystery of MySQL INT

When working with MySQL, one might encounter the enigmatic data type INT. To shed light on its meaning, let's unravel the following question:

INT: A Range of Values or a Display Trick?

Confusion arises when trying to understand the range of values that can be stored in an INT field. Let's consider INT(8) as an example. Does this mean the field can only hold values from 1 to 99999999 or the full unsigned range of 1 to 4294967295?

Official MySQL Documentation Unravels the Enigma

According to the official MySQL documentation, the answer is clear:

"The display width does not constrain the range of values that can be stored in the column."

In other words, the specified display width, such as INT(8), merely defines how the values are visually formatted when displayed. It does not limit the actual range of values that can be stored.

Therefore, regardless of the display width, an INT(8) field can accommodate any integer value within the signed range of -2^31 to 2^31-1. This range allows for a whopping 2,147,483,647 possible values.

Display Width: A Cosmetic Touch

The display width is solely an aesthetic choice that affects how the values appear when retrieved from the database. It may be useful for ensuring consistent formatting in UI elements or reports. However, it does not have any impact on the actual values stored in the database.

So, when working with MySQL INT fields, rest assured that the full range of integer values, both signed and unsigned, is at your disposal. The display width is merely a cosmetic embellishment that can be customized to suit your display needs.

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