his table shows the single-classed limitations on class, race and alignment that I use (courtesy of Danny Potts).
The table below is the 'by the book' rules, which I don't use.
These are from the PHB; note the updates from UA below.
This chart is from the UA errata, Dragon #103.
this chart is a by-the-book overall chart of class/race/alignment limitations. You may need to click on it to be able to read it.