To avoid confusion, ensure that aliases and column names are always unique in an SQL statement.
1	To	to	PART	_	_	2	mark	_	_
2	avoid	avoid	VERB	INF	VerbForm=Inf	5	advcl	_	_
3	confusion	confusion	NOUN	SG-NOM	Number=Sing	2	obj	_	SpaceAfter=No
4	,	,	PUNCT	Comma	_	2	punct	_	_
5	ensure	ensure	VERB	IMP	Mood=Imp|VerbForm=Fin	0	root	_	_
6	that	that	SCONJ	_	_	13	mark	_	_
7	aliases	alias	NOUN	PL-NOM	Number=Plur	13	nsubj	_	_
8	and	and	CCONJ	_	_	10	cc	_	_
9	column	column	NOUN	SG-NOM	Number=Sing	10	compound	_	_
10	names	name	NOUN	PL-NOM	Number=Plur	7	conj	_	_
11	are	be	AUX	PRES	Mood=Ind|Tense=Pres|VerbForm=Fin	13	cop	_	_
12	always	always	ADV	_	_	13	advmod	_	_
13	unique	unique	ADJ	POS	Degree=Pos	5	obj	_	_
14	in	in	ADP	_	_	17	case	_	_
15	an	an	DET	IND-SG	Definite=Ind|PronType=Art	17	det	_	_
16	SQL	SQL	PROPN	SG-NOM	Number=Sing	17	compound	_	_
17	statement	statement	NOUN	SG-NOM	Number=Sing	13	nmod	_	SpaceAfter=No
18	.	.	PUNCT	Period	_	5	punct	_	_
