Like the preceding table code, the actual queries run by the built-in standard pgbench tests are compiled into its source code, making the only way you can see them to refer to documentation such as http://www.postgresql.org/docs/current/static/pgbench.html.
The default transaction script, what's called the TPC-B (sort of) transaction when you run the test (and referred to here as the TPC-B-like transaction), issues seven commands per transaction. It looks like this inside the program:
\set nbranches :scale \set ntellers 10 * :scale \set naccounts 100000 * :scale \setrandom aid 1 :naccounts \setrandom bid 1 :nbranches \setrandom tid 1 :ntellers \setrandom delta -5000 5000 BEGIN; UPDATE pgbench_accounts SET abalance ...
