1.Find all violations of entity and referential integrities.

Customers

customer #	name	address1	address2	state	str	balance
456	ABC Corp.	111 Any St.	Houston	TX	6.25	34560.65
457	DEF CORP	222 ANYWHERE DR.	NEW YORK	NY	6.50	2145.90
458	GHI CORP.	5 SOMEPLACE CT	MIAMI	FL	6.45	45670.75
459	JKL CORP.	56 SOME DR.	BRYAN	TX	6.25	21009.50
460	MNO CORP.	7 NOPLACE CIR.	SAN DIEGO	CA	5.50	4561.00

INVOICE-ITEMS

INVOICE #	ITEM#	DESC	PRICE	QTY
1001	121	WIDGET	2.25	45
1001	540	BOLT	.40	25
1002	211	GEAR	3.70	10
1003	121	WIDET	2.25	15
1003	121	WIDGET	2.25	10
1006	348	NUT	0.25	5

INVOICES

INVOICE#	DATE	CUSTOMER#	AMOUNT
1001	11-1-95	456	450.75
1002	11-2-95	457	560.25
	11-2-95	460	300.10
1003	11-2-95	459	890.25
1004	11-3-95	450	425.50