and 4 others joined a min ago.
0
3.6kviews
What are fundamental relational algebra operations?
1 Answer
0
50views
written 19 months ago by
yashbeer
★ 11k
|
1] Select. $(\sigma)$
2] Project. $(\pi)$
3] Set intersection. (n)
4] Natural join.
1] Select $(\sigma)$ - It is used to specify any condition on relation.
syntax
$\sigma$ condition (R)
condition is executed on relation R.
$\sigma$ sal>1000 (customer)
when this query is executed all customers whose salary is more …
and 3 others joined a min ago.
ADD COMMENT
EDIT
Please log in to add an answer.