This is a very handy query that sorts your tables by their physical size in megabytes. Just be sure to edit the query to include the database name.

This is a very handy command to avoid running the same query twice. It will tell you how many total rows there are when you only need a handful. You need to run the second query immediately following the first. If you leave out SQL_CALC_FOUND_ROWS from the first query FOUND_ROWS() will simply return the number or results you got, 10 in this case.

This is more of a note to myself, but I use it to dump databases where there are additional fields in the new table. When you're upgrading a database you can either add the new fields to the old table or move the data from an older table to a newer one.