I’m not sure it’s a correct place to ask so please forgive me if it’s not. I want to be able to write sophisticated SQL queries. What is the best way to learn to write sophisticated SQL queries? Maybe there’s a list of example tasks somewhere over internet? Please note that I’m not a novice in MySQL, so please do not advise reading big books like “Mysql. Complete guide”. An article or a list of example tasks will be great!
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Search for SQL Challanges, there are several sites that pose problems, have a go at finding solutions and see what others do.
Try http://beyondrelational.com/ for starters.