It returns all customers from a (country|region) named "U % ", not all (countries|regions) beginning with the letter "U ", because the percent sign (%) is not a wildcard character in ANSI-89 SQL.
1	It	it	PRON	PERS-SG	_	2	nsubj	_	_
2	returns	return	VERB	PRES	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	0	root	_	_
3	all	all	DET	TOT-PL	_	4	det	_	_
4	customers	customer	NOUN	PL-NOM	Number=Plur	2	obj	_	_
5	from	from	ADP	_	_	7	case	_	_
6	a	a	DET	IND-SG	Definite=Ind|PronType=Art	7	det	_	_
7	(country|region)	(country|region)	NOUN	SG-NOM	Number=Sing	4	nmod	_	_
8	named	name	VERB	PASS	Tense=Past|VerbForm=Part|Voice=Pass	7	acl	_	_
9	"	&quot;	PUNCT	Quote	_	11	punct	_	SpaceAfter=No
10	U	u	NUM	CARD	Case=Nom	11	nummod	_	_
11	%	%	SYM	_	Number=Sing	8	obj	_	_
12	"	&quot;	PUNCT	Quote	_	11	punct	_	SpaceAfter=No
13	,	,	PUNCT	Comma	_	11	punct	_	_
14	not	not	PART	NEG	_	16	advmod	_	_
15	all	all	DET	TOT-PL	_	16	det	_	_
16	(countries|regions)	(countries|region)	NOUN	PL-NOM	Number=Plur	4	conj	_	_
17	beginning	begin	VERB	ING	Tense=Pres|VerbForm=Part	16	acl	_	_
18	with	with	ADP	_	_	22	case	_	_
19	the	the	DET	DEF	Definite=Def|PronType=Art	20	det	_	_
20	letter	letter	NOUN	SG-NOM	Number=Sing	22	compound	_	_
21	"	&quot;	PUNCT	Quote	_	22	punct	_	SpaceAfter=No
22	U	u	NOUN	SG-NOM	Case=Nom	17	obl	_	_
23	"	&quot;	PUNCT	Quote	_	22	punct	_	SpaceAfter=No
24	,	,	PUNCT	Comma	_	36	punct	_	_
25	because	because	SCONJ	_	_	36	mark	_	_
26	the	the	DET	DEF	Definite=Def|PronType=Art	28	det	_	_
27	percent	percent	NOUN	SG-NOM	Number=Sing	28	compound	_	_
28	sign	sign	NOUN	SG-NOM	Number=Sing	36	nsubj	_	_
29	(	(	PUNCT	LeftParenthesis	_	30	punct	_	SpaceAfter=No
30	%	%	SYM	_	Number=Sing	28	appos	_	SpaceAfter=No
31	)	)	PUNCT	RightParenthesis	_	30	punct	_	_
32	is	be	AUX	PRES	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	36	cop	_	_
33	not	not	PART	NEG	_	36	advmod	_	_
34	a	a	DET	IND-SG	Definite=Ind|PronType=Art	36	det	_	_
35	wildcard	wildcard	NOUN	SG-NOM	Number=Sing	36	compound	_	_
36	character	character	NOUN	SG-NOM	Number=Sing	2	obl	_	_
37	in	in	ADP	_	_	38	case	_	_
38	ANSI-89	ANSI-89	PROPN	SG-NOM	Number=Sing	36	nmod	_	_
39	SQL	SQL	PROPN	SG-NOM	Number=Sing	38	flat	_	SpaceAfter=No
40	.	.	PUNCT	Period	_	2	punct	_	_
