I was really over thinking it.
Allocate 100 minutes for test.
3 problems.
1st: given standard emp/dept, total sum of salary by department. 1 minute.
2nd: emp/dept again, gimme count of people by department. 1 minute.
3rd: given series of measurements, show the most recent measurement for each sensor. Problem wanted a correlated subquery, but the time stamps were unique, so I didn't need to match on multiple fields, and could use an simple min(time) feeding an "in" clause. 3 minutes.
Next interview (group attack) being set up.
Allocate 100 minutes for test.
3 problems.
1st: given standard emp/dept, total sum of salary by department. 1 minute.
2nd: emp/dept again, gimme count of people by department. 1 minute.
3rd: given series of measurements, show the most recent measurement for each sensor. Problem wanted a correlated subquery, but the time stamps were unique, so I didn't need to match on multiple fields, and could use an simple min(time) feeding an "in" clause. 3 minutes.
Next interview (group attack) being set up.