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SQL Server > Learn SQL Server > How does SQL Index work?
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How does SQL Index work?

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An SQL index is like a well-organized index at the back of a book. It helps the database find specific information quickly, just like how you can find a specific topic in a book using the index. There are two main types of indexes: clustered and non-clustered. A clustered index is like an index that's...
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An SQL index is like a well-organized index at the back of a book. It helps the database find specific information quickly, just like how you can find a specific topic in a book using the index.

 

There are two main types of indexes: clustered and non-clustered. A clustered index is like an index that's sorted by the book's chapters, while a non-clustered index is like an index sorted by topic.

 

Indexes can be unique, which means no two entries can have the same value, or non-unique, where multiple entries can have the same value.

 

Now, let's talk about how indexes can speed up queries. Imagine you're looking for a specific topic in a book. Without an index, you'd have to read the entire book to find it. But with an index, you can quickly jump to the right page. Similarly, a database can use an index to find the data it needs without having to search through every single row.

 

But remember, indexes can be a double-edged sword. They can speed up queries, but they also take up space and can slow down data modifications. So, it's important to use them wisely and only when necessary.
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