foreign key vs constraint

Keyword Analysis

Keyword	CPC	PCC	Volume	Score	Length of keyword
foreign key vs constraint	0.03	0.5	5350	13	25
foreign	1	0.6	8735	75	7
key	1.38	0.7	6464	48	3
vs	0.63	0.5	2588	57	2
constraint	0.17	0.3	2565	51	10

Keyword	CPC	PCC	Volume	Score
constraint vs foreign key	1.82	0.6	4445	98
foreign key vs foreign key constraint	1.58	0.3	3360	81
needed in a foreign key constraint	0.25	0.6	4351	16
how to add foreign key constraint	2	0.5	8381	2
set foreign key constraint	0.77	0.3	7193	91
adding foreign key constraint	1.05	0.5	3229	47
foreign key and foreign key constraint	0.2	0.5	3814	61
foreign key constraint syntax	1.12	0.5	9127	57
introducing foreign key constraint	0.16	1	5072	96
example of foreign key constraint	0.08	0.8	3539	32
list foreign key constraint	0.64	0.6	4153	58
foreign key constraint error	0.56	0.7	9741	64
what is a foreign key constraint sql	1.33	0.5	2168	98