Data Table

Table Name: TRADES

DATE	FIRM	SYMBOL	SIDE	QUANTITY	PRICE
2/3/2014	1ABC	A123	B	200	41
2/4/2014	2BCD	B234	B	600	60
2/7/2014	1ABC	C345	S	600	70
2/10/2014	3CDE	C345	S	600	70
2/12/2014	4DEF	B234	B	200	62
2/14/2014	3CDE	B234	B	300	61
2/21/2014	1ABC	A123	B	300	40
2/24/2014	1ABC	A123	S	300	30
2/25/2014	4DEF	C345	B	2100	71
2/27/2014	CDE	B234	S	1100	63

Q3. Your business user asks you to tell them the unique firm and symbol combinations in the data table above.

• Please write the SQL query you would use to query this table.
• Please show the exact results you expect based on your SQL query.