Exercise 3 (constraints, 4 pts) 1 Write a CHECK constraint that expresses the following condition on records in table Product in Hardware Database Maker H produces only printers 2 Write a CHECK constraint that expresses the following condition on table Schedule in University Database Each instructor occurring in this table teaches at most three classes per term Product maker model type B 1004 pc B 1005 pc B 1006 pc C 1007 pc D 1008 pc D 1009 pc D 1010 pc E 1011 pc E 1012 pc E 1013 pc E 2001 laptop E 2002 laptop E 2003 laptop A 2004 laptop A 2005 laptop A 2006 laptop B 2007 laptop F 2008 laptop F 2009 laptop G 2010 laptop E 3001 printer E 3002 printer E 3003 printer D 3004 printer D 3005 printer H 3006 printer H 3007 printer Schedule CourseId Term InstrId CS 200 Fall 2016 003 CS 200 Fall 2017 003 CS 300 Spring 2017 003 CS 400 Fall 2016 004 CS 400 Fall 2017 004 Math 200 Fall 2016 001 Math 200 Spring 2017 004 Math 200 Fall 2017 001 Phys 400 Spring 2017 002

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Question: Exercise 3 (constraints, 4 pts) 1.Write a CHECK constraint that expresses the following condition on records in table Product in Hardware Database: Maker H produces

Exercise 3 (constraints, 4 pts)

1.Write a CHECK constraint that expresses the following condition on records in table Product in Hardware Database: Maker H produces only printers.

2.Write a CHECK constraint that expresses the following condition on table Schedule in University Database: Each instructor occurring in this table teaches at most three classes per term.

**Product**
maker	model	type
B	1004	pc
B	1005	pc
B	1006	pc
C	1007	pc
D	1008	pc
D	1009	pc
D	1010	pc
E	1011	pc
E	1012	pc
E	1013	pc
E	2001	laptop
E	2002	laptop
E	2003	laptop
A	2004	laptop
A	2005	laptop
A	2006	laptop
B	2007	laptop
F	2008	laptop
F	2009	laptop
G	2010	laptop
E	3001	printer
E	3002	printer
E	3003	printer
D	3004	printer
D	3005	printer
H	3006	printer
H	3007	printer

**Schedule**
CourseId	Term	InstrId
CS 200	Fall 2016	003
CS 200	Fall 2017	003
CS 300	Spring 2017	003
CS 400	Fall 2016	004
CS 400	Fall 2017	004
Math 200	Fall 2016	001
Math 200	Spring 2017	004
Math 200	Fall 2017	001
Phys 400	Spring 2017	002

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