Monday, 9 November 2009

Building histograms using only MySQL

The query means a very simple thing: select count of matching rows, value of locations - grouped by locations field; rpad does all the magic - it basically says to add a certain number of '*' on the right of empty string, number of '*' is count(*). It's been divided by 15 to fit the bar into the console screen. That's it, chaps!

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