Find all procedures which cost more than 1000 or which physician John Wen was trained in.
SELECT name FROM procedures WHERE cost  >  1000 UNION SELECT T3.name FROM physician AS T1 JOIN trained_in AS T2 ON T1.employeeid  =  T2.physician JOIN procedures AS T3 ON T3.code  =  T2.treatment WHERE T1.name  =  "John Wen"
procedures which cost more than 1000 refers to cost > 1000; procedures which physician was trained in refers to JOIN between physician, trained_in, and procedures tables; physician John Wen refers to WHERE physician.name = 'John Wen'; UNION is used to combine results from more than one SELECT query.