What is the range of values that can be stored in a MySQL INT data type?

Decoding the Meaning of MySQL INT

The MySQL INT data type holds integer values, but the question arises: what's the range of values that it can store? By default, an INT without an explicit display width can store values from approximately -2 billion to 2 billion.

Display Width Clarification

Specifying a display width for INT, such as INT(4), does not limit the range of values that can be stored. It only controls the visual display in applications or result sets. The database still allows values that exceed the display width.

For instance, an INT(3) column can hold values within the SMALLINT range (-32768 to 32767). Even if a value exceeds three digits, it will be displayed in full. Therefore, the display width is for presentation purposes only.

Unsigned INT

MySQL also supports an unsigned INT, which has a range of 0 to approximately 4 billion. This type is used when negative values are not needed and thus saving storage space.

Conclusion

Understanding the behavior of the MySQL INT data type is crucial for proper database design. By default, it provides a wide range of integer values suitable for most applications. However, customizing the display width can enhance readability and consistency in result sets and user interfaces.

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