\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;

-- Optional mode change
-- SET TRANSACTION ISOLATION LEVEL SERIALIZABLE;

LOCK TABLE pgbench_accounts;
MERGE INTO pgbench_accounts t USING (SELECT :aid,1+(:aid / 1000000)::integer,:delta,'') AS s(aid,bid,balance,filler) ON s.aid=t.aid WHEN MATCHED THEN UPDATE SET abalance=abalance + s.balance WHEN NOT MATCHED THEN INSERT VALUES(s.aid,s.bid,s.balance,s.filler);
COMMIT;

-- This syntax worked with MERGE v203 patch, but isn't compatible with v204
--MERGE INTO pgbench_accounts t USING (VALUES (:aid,1+(:aid / 1000000)::integer,:delta,'')) AS s(aid,bid,balance,filler) ON s.aid=t.aid WHEN MATCHED THEN UPDATE SET abalance=abalance + s.balance WHEN NOT MATCHED THEN INSERT VALUES(s.aid,s.bid,s.balance,s.filler);