PHP/MySQL Nested <select> using <optgroup> with LEFT JOIN on same table in a single query.
I looked around on the web for a while trying to find an example of what I was trying to do. Some were close, but none performed the JOIN portion of the query and on the same table from the SELECT portion (self referencing). So, here is the code I used to created a sub-category only dropdown using the parent categories as the optgroup labels.
Minutes to Decimals Conversion Chart
Save time calculating your billable hours by using this handy conversion chart. It was modeled after http://www.p1m.com/unit.htm and placed here to ensure I could locate it at a later date in case it is ever removed from that site.