How does SQL Index work?

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Rakesh Kumar

IT Professional with 15+ years of experience in IT Industry

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. read less
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I need your help to choose my career as I have three years of gap between my education. I know SQL. Can anyone tell me should I choose MS SQL server or oracle because I am interested in the database? Which one will be better to learn to get into the IT industry? Please help me! Thank you!
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Hi, I'm an automation test engineer and a certified s/w test engineer (CSTE - QAI). I work with databases at a beginner level but I'm planning to master working with databases. I'm interested in taking a certification exam as-well. I am not interested in making a career switch but want to add it to my skill set. Considering my background, what training/certification should I go for? Please also suggest some beginner level certifications that would be helpful for me to add to my skill set.
Should be learn Biggener of Database then Advance Courses in DB.
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