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Dag J Nedrelid
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Quick Note on CROSS JOIN

By Dag, on December 30th, 2016

Example:
If you want to retrieve a last row of information from a table, you could search for the max/highest row ID that has been created in that table to be sure that you are working against the latest one.

"SELECT tblOne.* FROM tblOne, (SELECT MAX(ID) as maxID FROM tblOne) maxresults WHERE tblOne.ID = maxresults.maxID"

When you need a subquery in 1 query it's called a CROSS JOIN.