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Evaluate the following SQL statement: SQL> select cust_id, cust_last_name “Last name” FROM customers WHERE country_id = 10 UNION SELECT cust_id CUST_NO, cust_last_name FROM customers WHERE country_id = 30 Identify three ORDER BY clauses either one of which can complete the query.
A. ORDER BY “Last name”
B. ORDER BY 2, cust_id
C. ORDER BY CUST_NO
D. ORDER BY 2, 1
E. ORDER BY “CUST_NO”
Correct Answer: ABD
Using the ORDER BY Clause in Set Operations
-The ORDER BY clause can appear only once at the end of the compound query.
-Component queries cannot have individual ORDER BY clauses.
-The ORDER BY clause recognizes only the columns of the first SELECT query.
-By default, the first column of the first SELECT query is used to sort the output in an
Which two statements are true regarding the GROUP BY clause in a SQL statement? (Choose two.)
A. You can use column alias in the GROUP BY clause.
B. Using the WHERE clause after the GROUP BY clause excludes the rows after creating groups.
C. The GROUP BY clause is mandatory if you are using an aggregate function in the SELECT clause.
D. Using the WHERE clause before the GROUP BY clause excludes the rows before creating groups.
E. If the SELECT clause has an aggregate function, then those individual columns without an aggregate function in the SELECT clause should be included in the GROUP BY cause.
Correct Answer: DE
Which three statements are true reading subquenes?
A. A Main query can have many subqueries.
B. A subquery can have more than one main query.
C. The subquery and main query must retrieve date from the same table.
D. The subquery and main query can retrieve data from different tables.
E. Only one column or expression can be compared between the subquery and main query.
F. Multiple columns or expressions can be compared between the subquery and main query.
Correct Answer: ADF
View the exhibit and examine the structures of the EMPLOYEES and DEPARTMENTS tables. EMPLOYEES NameNull?Type
DEPARTMENT_IDNOT NULLNUMBER(4) DEPARTMENT_NAMENOT NULLVARCHAR2(30)
You want to update EMPLOYEES table as follows:
You issue the following command:
SQL> UPDATE employees
SET department_id =
WHERE location_id = 2100),
(salary, commission) =
(SELECT 1.1*AVG(salary), 1.5*AVG(commission)
FROM employees, departments
WHERE departments.location_id IN(2900, 2700, 2100))
WHERE department_id IN
WHERE location_id = 2900
OR location_id = 2700;
What is outcome?
A. It generates an error because multiple columns (SALARY, COMMISSION) cannot be specified together in an UPDATE statement.
B. It generates an error because a subquery cannot have a join condition in a UPDATE statement.
C. It executes successfully and gives the desired update
D. It executes successfully but does not give the desired update
Correct Answer: D
Which statement is true regarding the default behavior of the ORDER BY clause?
A. In a character sort, the values are case-sensitive.
B. NULL values are not considered at all by the sort operation.
C. Only those columns that are specified in the SELECT list can be used in the ORDER BY clause.
D. Numeric values are displayed from the maximum to the minimum value if they have decimal positions.
Correct Answer: A
In which three situations does a transaction complete?
A. when a PL/SQL anonymous block is executed
B. when a DELETE statement is executed
C. when a ROLLBACK command is executed
D. when a data definition language (DDL) statement is executed
E. when a TRUNCATE statement is executed after the pending transaction
Correct Answer: CDE
Examine the structure of the PROGRAMS table:
Which two SQL statements would execute successfully?
A. SELECT NVL (ADD_MONTHS (END_DATE,1) SYSDATE) FROM programs;
B. SELECT TO_DATE (NVL (SYSDATE-END_DATE, SYSDATE)) FROM programs;
C. SELECT NVL (MONTHS_BETWEEN (start_date, end_date), `Ongoing\’) FROM programs;
D. SELECT NVL (TO_CHAR (MONTHS_BETWEEN (start-date, end_date)), `Ongoing\’) FROM programs
Correct Answer: AD
Which statement is true regarding the default behaviour of the ORDER by clause?
A. Numeric values are displayed in descending order if they have decimal positions.
B. Only columns that are specified in the SELECT list can be used in the ORDER by clause.
C. In a character sort, the values are case-sensitive.
D. NULLs are not including in the sort operation
Correct Answer: C
Examine the structure of the MEMBERS table: NameNull-Type
MEMBER_IDNOT NULLVARCHAR2 (6)
LAST_NAMENOT NULLVARCHAR2 (50)
You want to display details of all members who reside in states starting with the letter A followed by exactly one character.
Which SQL statement must you execute?
A. SELECT * FROM MEMBERS WHERE state LIKE \’%A_*;
B. SELECT * FROM MEMBERS WHERE state LIKE \’A_*;
C. SELECT * FROM MEMBERS WHERE state LIKE \’A_%\’;
D. SELECT * FROM MEMBERS WHERE state LIKE \’A%\’;
Correct Answer: B
Evaluate the following statement. INSERT ALL WHEN order_total 10000 AND order_total 200000 AND order_total < 20000 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?
A. They are evaluated by all the three WHEN clauses regardless of the results of the evaluation of any other WHEN clause.
B. They are evaluated by the first WHEN clause. If the condition is true, then the row would be evaluated by the subsequent WHEN clauses.
C. They are evaluated by the first WHEN clause. If the condition is false, then the row would be evaluated by the subsequent WHEN clauses.
D. The insert statement would give an error because the ELSE clause is not present for support in case none of WHEN clauses are true.
Correct Answer: A
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