Histogram

A histogram is a display of tabulated frequencies. The chart above is an image of employee monthly salary rate. The charts contains two variables the number of employees on the left and the salary made on the bottom of the chart. From the chart you can see that an average or most of the employees make &2,100 and $4,290 a month. There is only one employee that makes over $24,000, which is most likely the owner of that particular company.
Source: http://quantmeditate.blogspot.com/2005/03/creating-histograms-using-sql-function.html