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Oracle Database SQL Sample Questions (Q255-Q260):

NEW QUESTION # 255
Which three statements are true regarding group functions? (Choose three.)

A. They can be used only on one column in the SELECT clause.
B. They can be used on columns or expressions.
C. They can be used with a SQL statement that has a GROUP BY clause.
D. They can be passed as an argument to another group function.
E. They can be used together with the single-row functions in the SELECT clause.

Answer: B,D,E

Explanation:
References:
https://www.safaribooksonline.com/library/view/mastering-oracle-sql/0596006322/ch04.html

NEW QUESTION # 256
Which three are true about scalar subquery expressions? (Choose three.)

A. A scalar subquery expression that returns zero rows evaluates to zero.
B. They cannot be used in GROUP BY clauses.
C. They cannot be used in the VALUES clause of an INSERT statement.
D. They can be used as default values for columns in a CREATE TABLE statement.
E. They can be nested.
F. A scalar subquery expression that returns zero rows evaluates to NULL.

Answer: D,E,F

Explanation:
https://docs.oracle.com/cd/B12037_01/server.101/b10759/expressions010.htm

NEW QUESTION # 257
Which two statements are true about the ORDER BYclause when used with a SQL statement containing a SET operator such as UNION? (Choose two.)

A. Only column names from the first SELECTstatement in the compound query are recognized.
B. Each SELECT statement in the compound query must have its own ORDER BYclause.
C. Column positions must be used in the ORDER BYclause.
D. The first column in the first SELECTof the compound query with the UNIONoperator is used by default to sort output in the absence of an ORDER BYclause.
E. Each SELECTstatement in the compound query can have its own ORDER BYclause.

Answer: A,E

NEW QUESTION # 258
Examine the data in the PRODUCTS table:

Examine these queries:
1. SELECT prod name, prod list
FROM products
WHERE prod 1ist NOT IN(1020) AND category _id=1;
2. SELECT prod name, | prod _ list
FROM products
WHERE prod list < > ANY (1020) AND category _id= 1;
SELECT prod name, prod _ list
FROM products
WHERE prod_ list <> ALL (10 20) AND category _ id= 1;
Which queries generate the same output?

A. 1 and 2
B. 1 and 3
C. 1, 2 and 3
D. 2 and 3

Answer: B

Explanation:
Based on the given PRODUCTS table and the SQL queries provided:
* Query 1: Excludes rows where prod_list is 10 or 20 and category_id is 1.
* Query 2: Includes rows where prod_list is neither 10 nor 20 and category_id is 1.
* Query 3: Excludes rows where prod_list is both 10 and 20 (which is not possible for a single value) and category_id is 1.
The correct answer is A, queries 1 and 3 will produce the same result. Both queries exclude rows where prod_list is 10 or 20 and include only rows from category_id 1. The NOT IN operator excludes the values within the list, and <> ALL operator ensures that prod_list is not equal to any of the values in the list, which effectively excludes the same set of rows.
Query 2, using the <> ANY operator, is incorrect because this operator will return true if prod_list is different from any of the values in the list, which is not the logic represented by the other two queries.

NEW QUESTION # 259
Which two statements are true about an Oracle database? (Choose two.)

A. A table can have multiple primary keys.
B. A VARCHAR2column without data has a NULLvalue.
C. A table can have multiple foreign keys.
D. A column definition can specify multiple data types.
E. A NUMBERcolumn without data has a zero value.

Answer: C,E

NEW QUESTION # 260
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