If the following statement is executed:
CREATE TABLE tab1 (col1 INTEGER NOT NULL,
col2 INTEGER,
CONSTRAINT const1 FOREIGN KEY (col2)
REFERENCES tab1(col1));
How many unique indexes are defined for table TAB1?
A.
0
B.
1
C.
2
D.
3
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both Co1 and Co2 and not unique
0
0
NOT NULL is not an index
0
0