Signed vs Unsigned Data Types in SQL What's the Difference?

In this video titled "Signed vs Unsigned Data Types in SQL: What's the Difference?", we'll explore the concepts of signed and unsigned data types in SQL, highlighting their significance and applications.

Here’s a breakdown of the key areas discussed in the video:

00:00 Introduction
00:26 Signed vs Unsigned Data Types
01:15 Why Use Signed and Unsigned Data Types?
03:33 Converting Between Signed and Unsigned Data Types
05:14 Benefits of Using Unsigned Data Types
06:06 Conclusion

What are signed data types?
Signed data types can store both positive and negative values. For example, an INT data type in SQL can hold values ranging from -2,147,483,648 to 2,147,483,647. This is useful when the data being stored can naturally have negative values, such as in financial calculations or temperature readings.

What are unsigned data types?
Unsigned data types, on the other hand, can only store non-negative values, effectively doubling the upper limit of the data type's range. For instance, an UNSIGNED INT can hold values from 0 to 4,294,967,295. This is advantageous when you know that negative values will never be part of your data, such as in scenarios involving counts or ages.

When should you use signed vs. unsigned?
Choosing between signed and unsigned data types depends on the nature of the data you intend to store. If you need to accommodate negative values, opt for signed data types. If your data will always be positive, consider using unsigned data types to maximise the range of possible values.

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