What is the delivery time and the clerk of order number 6?
delivery time = subtract(l_receiptdate, l_commitdate); clerk refers to o_clerk; order number 6 refers to o_orderkey = 6
SELECT JULIANDAY(T2.l_receiptdate) - JULIANDAY(T2.l_commitdate), T1.o_clerk FROM orders AS T1 INNER JOIN lineitem AS T2 ON T1.o_orderkey = T2.l_orderkey WHERE T1.o_orderkey = 6