Aircraft_Models Airlines Fleet

MID	manufacturer	model	capacity		AID	name		AID	MID	count
1	Boeing	777	340		1	AA		1	3	15
2	Boeing	787	260		2	UAL		1	2	10
3	Boeing	737	140		3	DAL		2	2	14
4	Airbus	320	230		4	SWA		3	1	8
5	Airbus	380	560		5	ASA		3	6	24
6	Boeing	747	420					4	3	7
								5	3	16

5. What is the result of the following expression in relational algebra?

p_{s.name, t.AID} (s_{s.name = t.name} ( r _s (Airlines) x r _t (Airlines)))