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by ScottWhigham 4380 days ago
Without more info about what your work or life are about, it's hard to suggest something too specific. Since we're being generic, I'd say that it's hard to beat the value of learning how relational databases work. Focus on learning the basics of SELECT - that takes months but you can get the rudimentary parts down in a week. If you already know the basics, then look into index design. Why/when/how and all that.