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Learn to write SQL queries to select and analyze data, and improve your ability to manipulate data. Leveling Up with SQL by Mark Simon. Title Leveling Up with SQL. Mark Simon has been involved in training and education since the beginning of his career.
When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.