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DAY 29/100: SEQUENCE in SQL
In this video, we explain how SQL sequences work in the simplest way possible. Imagine being at a food truck festival where orders are handed out in sequence,
just like how SQL assigns numbers to records using sequences. We’ll walk you through the process with a real-time example, easy-to-follow code, and a clear explanation.
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*Most Asked Q&A:*

1. *What is a sequence in SQL?*
A sequence in SQL is an object that generates unique numeric values in a sequential order, often used for assigning IDs or order numbers automatically.

2. *What’s the difference between AUTO_INCREMENT and SEQUENCE?*
AUTO_INCREMENT is used to automatically assign unique IDs in MySQL, while SEQUENCE is a more flexible and commonly used in databases like PostgreSQL, Oracle, and SQL Server.

3. *Can I control the starting number for a sequence?*
Yes, you can set the starting value using the `START WITH` clause when creating a sequence.

4. *How do I get the next value from a sequence?*
You can use the `NEXT VALUE FOR sequence_name` command to retrieve the next value in a sequence.

5. *What happens when a sequence reaches its max value?*
If a sequence reaches its maximum value, it can either stop generating numbers or cycle back to the start, depending on whether you use the `CYCLE` or `NO CYCLE` option.

6. *Can a sequence generate numbers in descending order?*
Yes, by setting the `INCREMENT BY` value to a negative number, a sequence can generate numbers in reverse order.

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