1z0-071 Exam Dumps | Which two are true about self joins?

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Question 117/139

Which two are true about self joins?

A. They are always equijoins.

B. They require the NOT EXISTS operator in the join condition.

C. They have no join condition.

D. They can use INNER JOIN and LEFT JOIN.

E. They require table aliases.

F. They require the EXISTS opnrator in the join condition.

Correct Answer: D,E

Self joins in Oracle Database 12c SQL have these characteristics:
* Option D: They can use INNER JOIN and LEFT JOIN.
* Self joins can indeed use various join types, including inner and left outer joins. A self join is a regular join, but the table is joined with itself.
* Option E: They require table aliases.
* When a table is joined to itself, aliases are required to distinguish between the different instances of the same table within the same query.
Options A, B, C, and F are incorrect:
* Option A is incorrect because self joins can be non-equijoins as well.
* Option B is incorrect because self joins do not require the NOT EXISTS operator. They may require a condition, but NOT EXISTS is not a necessity.
* Option C is incorrect because a join condition is needed to relate the two instances of the same table in a self join.
* Option F is incorrect for the same reason as B; the EXISTS operator is not a requirement for self joins.

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