A Vertical Excel Table
If you have Excel 2007 or above, and you work in a company with much data, you've probably seen Excel Tables that look something like this one.
(I've hidden most of the rows and/or columns in the middle of most of the tables on this page, which will allow you to see all four corners of the tables.)
I call this a Vertical Table because the dates are in a column, which is vertical, of course.
The general format of this table is typical of what you get with data that comes from a relational database. It's got fields for dates, a key code, and an amount...each in long columns.
Notice that this table has no description for the Codes, and it has no additional information about each Code. This is because relational databases—and also Power Pivot for Excel—are much more efficient if their tables are tall and skinny like this.