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Oracle Database SQL Sample Questions (Q64-Q69):

NEW QUESTION # 64
Examine the data in the COLORS table:

Examine the data in the BRICKS table:

Which two queries return all the rows from COLORS?

Answer: A,D


NEW QUESTION # 65
Table ORDER_ITEMS contains columns ORDER_ID, UNIT_PRICE and QUANTITY, of data type NUMBER Statement 1:
SELECT MAX (unit price*quantity) "Maximum Order FROM order items;
Statement 2:
SELECT MAX (unit price*quantity "Maximum order" FROM order items GROUP BY order id; Which two statements are true?

Answer: B,C


NEW QUESTION # 66
Examine this SQL statement:

Which two are true?

Answer: C,D


NEW QUESTION # 67
View the Exhibit and examine the data in the PRODUCT_INFORMATION table.

Which two tasks would require subqueries? (Choose two.)

Answer: A,E


NEW QUESTION # 68
Which two are true about self joins?

Answer: C,E

Explanation:
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.


NEW QUESTION # 69
......

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