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SQL stands for Structured Query Language, and it is a programming language that is entirely designed for the management of data in a database system. Knowing SQL is an essential skill for today's programmer, and if you are looking for a career in information tech, you will quickly realize that SQL can push you far ahead of the rest of the people competing for the position. SQL is a very rich, very developed language, and a chart is great for keeping in mind the structures and the specific syntax that is used.