Create adricBeginTry

Example script demonstrating:

(a) Begin / End Try & Error capture on @@trancount
(b) Also backed up table before running transaction statement, and I show my practice of running SELECT queries before the UPDATE statement, and after the UPDATE...so that I get to see what was and what will change, before I COMMIT anything
(c) Also updating one table using INNER JOIN from prior created table with PKs needed