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Sometimes when aggregating data with SQL, we’d love to add some additional filters. For instance, consider the following world bank data:                 GDP per capita (current US$) 2009 2010 2011 2012 CA 40,764 47,465 51,791 52,409 DE 40,270 40,408 44,355 42,598 FR 40,488 39,448 42,578 39,759 GB 35,455 […]