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Oracle Database SQL Expert

Question No: 1

Which three possible values can be set for the TIME_ZONE session parameter by using the ALTER SESSION command? (Choose three.)

  1. #39;os#39;

  2. local

C. -8:00#39;

  1. dbtimezone Li

  2. #39;Australia#39;

Answer: B,C,D

Question No: 2

EMPDET is an external table containing the columns EMPNO and ENAME. Which command would work in relation to the EMPDET table?

  1. UPDATE empdet SET ename = #39;Amit#39; WHERE empno = 1234;

  2. DELETE FROM empdet WHERE ename LIKE #39;J%#39;;

  3. CREATE VIEW empvu AS

    SELECT* FROM empdept;

  4. CREATE INDEX empdet_dx ON empdet(empno);

Answer: C

Question No: 3

Which three tasks can be performed using regular expression support in Oracle Database 10g? (Choose three.)

  1. it can be used to concatenate two strings.

  2. it can be used to find out the total length of the string.

  3. it can be used for string manipulation and searching operations.

  4. it can be used to format the output for a column or expression having string data.

  5. it can be used to find and replace operations for a column or expression having string data.

Answer: C,D,E

Question No: 4

Which three statements are true regarding single-row functions? (Choose three.)

  1. They can accept only one argument.

  2. They can be nested up to only two levels.

  3. They can return multiple values of more than one data type.

  4. They can be used in SELECT, WHERE, and ORDER BY clauses.

  5. They can modify the data type of the argument that is referenced.

  6. They can accept a column name, expression, variable name, or a user-supplied constant as arguments.

Answer: D,E,F

Question No: 5

View the Exhibit and examine the structure of the ORDERS and ORDERJTEMS tables. Evaluate the following SQL statement:

SELECT oi.order_id, product_jd, order_date FROM order_items oi JOIN orders o USING(order_id);

Which statement is true regarding the execution of this SQL statement?

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  1. The statement would not execute because table aliases are not allowed in the JOIN clause.

  2. The statement would not execute because the table alias prefix is not used in the USING clause.

  3. The statement would not execute because all the columns in the SELECT clause are not prefixed with table aliases.

  4. The statement would not execute because the column part of the USING clause cannot have a qualifier in the SELECT list.

Answer: D

Question No: 6

Which two statements are true regarding the execution of the correlated subqueries? (Choose two.)

  1. The nested query executes after the outer query returns the row.

  2. The nested query executes first and then the outer query executes.

  3. The outer query executes only once for the result returned by the inner query.

  4. Each row returned by the outer query is evaluated for the results returned by the inner query.

Answer: A,D

Question No: 7

Evaluate the CREATE TABLE statement:

CREATE TABLE products

(product_id NUMBER(6) CONSTRAINT prod_id_pk PRIMARY KEY, product_name VARCHAR2(15));

Which statement is true regarding the PROD_ID_PK constraint?

  1. It would be created only if a unique index is manually created first.

  2. It would be created and would use an automatically created unique index.

  3. It would be created and would use an automatically created nonunique index.

  4. It would be created and remains in a disabled state because no index is specified in the command.

Answer: B

Question No: 8

View the Exhibit and examine the data in the PRODUCT INFORMATION table.

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

  1. displaying the minimum list price for each product status

  2. displaying all supplier IDs whose average list price is more than 500

  3. displaying the number of products whose list prices are more than the average list price

  4. displaying all the products whose minimum list prices are more than the average list

    price of products having the product status orderable

  5. displaying the total number of products supplied by supplier 102071 and having product status OBSOLETE

Answer: C,D

Question No: 9

Which statement best describes the GROUPING function?

  1. It is used to set the order for the groups to be used for calculating the grand totals and subtotals.

  2. It is used to form various groups to calculate total and subtotals created using ROLLUP and CUBE operators.

  3. It is used to identify if the NULL value in an expression is a stored NULL value or created by ROLLUP or CUBE.

  4. It is used to specify the concatenated group expressions to be used for calculating the grand totals and subtotals.

Answer: C

Question No: 10

Evaluate the following statement: INSERT ALL

WHEN order_total lt; 10000 THEN INTO small_orders

WHEN order_total gt; 10000 AND order_total lt; 20000 THEN INTO medium_orders

WHEN order_total gt; 2000000 THEN INTO large_orders

SELECT order_id, order_total, customer_id

FROM orders;

Which statement is true regarding the evaluation of rows returned by the subquery in the INSERT statement?

  1. They are evaluated by all the three WHEN clauses regardless of the results of the evaluation of any other WHEN clause.

  2. They are evaluated by the first WHEN clause. If the condition is true, then the row would be evaluated by the subsequent WHEN clauses.

  3. They are evaluated by the first WHEN clause. If the condition is false, then the row would be evaluated by the subsequent WHEN clauses.

  4. The INSERT statement would give an error because the ELSE clause is not present for support in case none of the WHEN clauses are true.

Answer: A

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