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Indexes are a very useful feature of SQL databases. They can be created easily and can docHubly improve the performance of your queries. If you want to know all about indexes, from the basics of what an index is, the different types of indexes, and even some tips on when you should create an index, keep watching. In this video, Ill share a simple explanation of what an index is in an SQL database. Well look at how to create a simple index including the SQL scripts for Oracle, SQL Server, PostgreSQL, and MySQL. Well look at a few different types of indexes, and finish off by looking at some tips on when indexes have the most impact. Lets get into it. Have you ever looked at a big book, like a textbook, and tried to look for a specific topic? Lets say you have a textbook on the history of human civilisation, and you wanted to find the section on Julius Caesar. You might have some idea of what page this topic is discussed. It was in Roman times, so it m
