Keyword Analysis & Research: foreign key can be null

Keyword Analysis

Keyword	CPC	PCC	Volume	Score	Length of keyword
foreign key can be null	1.16	0.6	487	86	23
foreign	0.34	0.8	1903	67	7
key	0.2	0.7	4767	78	3
can	1.91	1	3445	89	3
be	1.37	0.1	6268	46	2
null	0.55	0.8	9241	57	4

Keyword	CPC	PCC	Volume	Score
foreign key can be null	0.95	0.4	9170	39