how does exists work in sql

Keyword Analysis

Keyword	CPC	PCC	Volume	Score	Length of keyword
how does exists work in sql	0.74	0.5	7182	17	27
how	1.74	0.9	7708	37	3
does	0.12	0.6	776	86	4
exists	1.62	0.9	1191	40	6
work	1	0.3	1301	73	4
in	0.81	0.7	1875	77	2
sql	0.04	0.9	6855	100	3

Keyword	CPC	PCC	Volume	Score
how does exists work in sql	0.28	1	8276	90
how not exists work in sql	1.95	0.7	8082	6
what does exists mean in sql	1.48	0.6	1380	63
what is exists in sql server	1.36	0.7	1291	93
exists in ms sql	1.58	0.6	4820	64
sql exists stack overflow	1.21	0.9	1033	3
not exists in sql	0.59	1	8378	75
not exist in sql server	0.09	0.7	2155	22
not exist in sql example	1.15	0.2	3268	42
not exist in sql oracle	1.37	0.9	6997	49
not exist in sql w3schools	0.63	0.4	7536	16
sql not in not exists	1.22	0.3	7748	8
how to use not exist in sql	1.84	1	4586	91
if not exists in sql server	1.13	1	2853	85
ms sql not exists	1.47	0.8	6729	84