Code to simulate deadlock
The best way would be to use tables you already have. 
Create two tables -- table-a, table-b
For a test you can even update the same column with the same information
so you don't affect any real data.

For instance
UPDATE table_a set ID = ID where ID = 100;

Open two sessions to the same database.
On one, run

BEGIN TRAN
update table_a set ID=ID where ID = 100;


On two run

BEGIN TRAN
update table_b set ID=ID where ID =100;


Then, copy the update statements to the opposing sessions and run at the same time.
In one,

update table_b set ID=ID where ID =100;


In two

update table_a set ID=ID where ID = 100;


I just tried this now and got on MS-SQL

Msg 1205, Level 13, State 56, Line 1
Transaction (Process ID 23) was deadlocked on lock resources with another process and has been chosen as the deadlock victim. Rerun the transaction.