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Development Tools Database Foundations Securing and Maintaining a MySQL Database Indexing Columns in MySQL

Just to clarify my understanding of Database Indexing...

Hi everyone,

I just want to make sure I understand what's going on when we index a table in a database.

Does it create a literal index, as in A, B, C, D etc?

So when I run :

SELECT * FROM table WHERE col = "Something"

the database starts looking from the 'S' index rather than the top of the table?

Or is there a bit more to it than that?



1 Answer

Well, you've got the basics, but as you guessed there is a bit more to it. Here's a good overview: http://www.programmerinterview.com/index.php/database-sql/what-is-an-index/

Thanks, I'll give it a read.