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Oracle Database SQL Sample Questions (Q177-Q182):

NEW QUESTION # 177
Which statement fails to execute successfully?

Answer: D

Explanation:
In Oracle SQL, when performing a JOIN operation, the ON clause is used to specify the condition that relates the two tables being joined. The WHERE clause can be used to further filter the result set.
A) This is a valid join condition using the WHERE clause to filter the rows after the join has been made.
B) This statement will fail because the ON clause should only contain conditions that relate the two tables. The condition for filtering the departments table should be in the WHERE clause, not in the ON clause. This is a common mistake when writing JOIN statements.
C) This is a correct statement. The ON clause specifies how the tables are related and the WHERE clause specifies an additional filtering condition for the query.
D) This statement is also correct. It's similar to the first statement (A) and properly places the department_id filter in the ON clause, which is acceptable though not typically best practice as it can be less readable than using a WHERE clause for non-join conditions.
When the JOIN operation is executed, the database first pairs rows from the joined tables that meet the join condition specified by the ON clause. Then, it filters the result of the JOIN operation based on the condition specified in the WHERE clause.
Reference:
Oracle Documentation on Joins: https://docs.oracle.com/database/121/SQLRF/queries006.htm#SQLRF52359

NEW QUESTION # 178
View the exhibit and examine the description of the PRODUCT_INFORMATION table.

Which SQL statement would retrieve from the table the number of products having LIST_PRICE as NULL?

A. SELECT COUNT (list_price)FROM product_informationWHERE list_price i= NULL
B. SELECT COUNT (list_price)FROM product_informationWHERE list_price is NULL
C. SELECT COUNT (DISTINCT list_price)FROM product_informationWHERE list_price is NULL
D. SELECT COUNT (NVL(list_price, 0))FROM product_informationWHERE list_price is NULL

Answer: D

NEW QUESTION # 179
Which two statements are true about INTERVAL data types

A. INTERVAL YEAR TO MONTH columns support yearly intervals.
B. INTERVAL YEAR TO MONTH columns only support monthly intervals within a single year.
C. The YEAR field in an INTERVAL YEAR TO MONTH column must be a positive value.
D. INTERVAL DAY TO SECOND columns support fractions of seconds.
E. INTERVAL YEAR TO MONTH columns only support monthly intervals within a range of years.
F. The value in an INTERVAL DAY TO SECOND column can be copied into an INTERVAL YEAR TO MONTH column.

Answer: D,E

Explanation:
Regarding INTERVAL data types in Oracle Database 12c:
* A. INTERVAL YEAR TO MONTH columns only support monthly intervals within a range of years. This is true. The INTERVAL YEAR TO MONTH data type stores a period of time using years and months.
* E. INTERVAL DAY TO SECOND columns support fractions of seconds. This is true. The INTERVAL DAY TO SECOND data type can store days, hours, minutes, seconds, and fractional seconds.
Options B, C, D, and F are incorrect:
* B is incorrect because data types between INTERVAL DAY TO SECOND and INTERVAL YEAR TO MONTH are not compatible.
* C is incorrect as it incorrectly limits INTERVAL YEAR TO MONTH to a single year.
* D is incorrect; the YEAR field can be negative to represent a past interval.
* F is incorrect as INTERVAL YEAR TO MONTH supports intervals that can span multiple years, not just annual increments.

NEW QUESTION # 180
Which three statements are true about multiple-row subqueries?

A. They can contain a subquery within a subquery.
B. They cannot contain a subquery within a subquery.
C. They can contain group functions and GROUP BYand HAVINGclauses.
D. They can return only one column but multiple rows.
E. They can return multiple columns as well as rows.
F. They can contain group functions and the GROUP BYclause, but not the HAVINGclause.

Answer: A,C,E

NEW QUESTION # 181
View the Exhibit and examine the structure of the CUSTOMERS table.

Evaluate the following SQL statement:

Which statement is true regarding the outcome of the above query?

A. It executes successfully.
B. It returns an error because WHERE and HAVING clauses cannot be used in the same SELECT statement.
C. It returns an error because the BETWEEN operator cannot be used in the HAVING clause.
D. It returns an error because WHERE and HAVING clauses cannot be used to apply conditions on the same column.

Answer: A

NEW QUESTION # 182
......

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