Consider the following SQL query select distinct a1, a2, ..., an from r1,…
GATE · 2003 · CS
Consider the following SQL query
select distinct a1, a2, ..., an
from r1, r2,........, rm
where P For an arbitrary predicate P, this query is equivalent to which of the following relational algebra expressions ?
- A.
A
- B.
B
- C.
C
- D.
D
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