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Q1. - (Topic 1)
View the Exhibit and examine the structure of the SALES table.
The following query is written to retrieve all those product IDs from the SALES table that have more than 55000 sold and have been ordered more than 10 times.
Which statement is true regarding this SQL statement?
A. It executes successfully and generates the required result.
B. It produces an error because COUNT(*) should be specified in the SELECT clause also.
C. It produces an error because COUNT(*) should be only in the HAVING clause and not in the WHERE clause.
D. It executes successfully but produces no result because COUNT(prod_id) should be used instead of COUNT(*).
Answer: C
Explanation:
Restricting Group Results with the HAVING Clause
You use the HAVING clause to specify the groups that are to be displayed, thus further
restricting the groups on the basis of aggregate information.
In the syntax, group_condition restricts the groups of rows returned to those groups for
which the specified condition is true.
The Oracle server performs the following steps when you use the HAVING clause:
1.
Rows are grouped.
2.
The group function is applied to the group.
3.
The groups that match the criteria in the HAVING clause are displayed.
The HAVING clause can precede the GROUP BY clause, but it is recommended that you
place the GROUP BY clause first because it is more logical. Groups are formed and group
functions are calculated before the HAVING clause is applied to the groups in the SELECT
list.
Note: The WHERE clause restricts rows, whereas the HAVING clause restricts groups.
Q2. - (Topic 1)
You work as a database administrator at ABC.com. You study the exhibit carefully. Exhibit
Using the PROMOTIONS table, you need to display the names of all promos done after
January 1, 2001 starting with the latest promo.
Which query would give the required result? (Choose all that apply.)
A. SELECT promo_name,promo_begin_date
FROM promotions
WHERE promo_begin_date > '01-JAN-01'
ORDER BY 1 DESC;
B. SELECT promo_name,promo_begin_date "START DATE"
FROM promotions
WHERE promo_begin_date > '01-JAN-01'
ORDER BY "START DATE" DESC;
C. SELECT promo_name,promo_begin_date
FROM promotions
WHERE promo_begin_date > '01-JAN-01'
ORDER BY 2 DESC;
D. SELECT promo_name,promo_begin_date
FROM promotions
WHERE promo_begin_date > '01-JAN-01'
ORDER BY promo_name DESC;
Answer: B,C
Q3. - (Topic 1)
See the Exhibit and examine the structure and data in the INVOICE table: Exhibit:
Which two SQL statements would executes successfully? (Choose two.)
A. SELECT MAX(inv_date),MIN(cust_id) FROM invoice;
B. SELECT MAX(AVG(SYSDATE - inv_date)) FROM invoice;
C. SELECT (AVG(inv_date) FROM invoice;
D. SELECT AVG(inv_date - SYSDATE),AVG(inv_amt) FROM invoice;
Answer: A,D
Q4. - (Topic 1)
Evaluate the following SQL statements: Exhibit:
Which is the correct output of the above query?
A. +00-300, +54-02,+00 11:12:10.123457
B. +00-300,+00-650,+00 11:12:10.123457
C. +25-00, +54-02, +00 11:12:10.123457
D. +25-00,+00-650,+00 11:12:10.123457
Answer: C
Q5. - (Topic 2)
Examine the SQL statement that creates ORDERS table:
CREATE TABLE orders (SER_NO NUMBER UNIQUE, ORDER_ID NUMBER, ORDER_DATE DATE NOT NULL, STATUS VARCHAR2(10) CHECK (status IN ('CREDIT', 'CASH')), PROD_ID NUMBER REFERENCES PRODUCTS(PRODUCT_ID), ORD_TOTAL NUMBER, PRIMARY KEY (order_id, order_date));
For which columns would an index be automatically created when you execute the above SQL statement? (Choose two.)
A. SER_NO
B. ORDER_ID
C. STATUS
D. PROD_ID
E. ORD_TOTAL
F. composite index on ORDER_ID and ORDER_DATE
Answer: A,F
Explanation: Index exist for UNIQUE and PRIMARY KEY constraints
Incorrect Answer: BORDER_ID is neither UNIQUE nor PRIMARY KEY CSTATUS is neither UNIQUE nor PRIMARY KEY DPROD_ID is neither UNIQUE nor PRIMARY KEY EORD_TOTAL is neither UNIQUE nor PRIMARY KEY
Refer: Introduction to Oracle9i: SQL, Oracle University Study Guide, 10-15
Q6. - (Topic 2)
Which are iSQL*Plus commands? (Choose all that apply.)
A. INSERT
B. UPDATE
C. SELECT
D. DESCRIBE
E. DELETE
F. RENAME
Answer: D
Explanation:
The only SQL*Plus command in this list : DESCRIBE. It cannot be used as SQL command. This command returns a description of tablename, including all columns in that table, the datatype for each column and an indication of whether the column permits storage of NULL values.
Incorrect Answer: A INSERT is not a SQL*PLUS command B UPDATE is not a SQL*PLUS command C SELECT is not a SQL*PLUS command E DELETE is not a SQL*PLUS command F RENAME is not a SQL*PLUS command
Refer: Introduction to Oracle9i: SQL, Oracle University Study Guide, 7
Q7. - (Topic 2)
Top N analysis requires _____ and _____. (Choose two.)
A. the use of rowid
B. a GROUP BY clause
C. an ORDER BY clause
D. only an inline view
E. an inline view and an outer query
Answer: C,E
Explanation:
The correct statement for Top-N Analysis SELECT [coloumn_list], ROWNUM FROM (SELECT [coloumn_list]
FROM table
ORDER BY Top-N_coloumn)
WHERE ROWNUM <= N;
Incorrect Answer:
AROWID is not require
BGROUP BY clause is not require
DMust have inline view and outer query.
Refer: Introduction to Oracle9i: SQL, Oracle University Study Guide, 11-23
Q8. - (Topic 2)
The STUDENT_GRADES table has these columns:
STUDENT_ID NUMBER(12)
SEMESTER_END DATE
GPA NUMBER(4,3)
The registrar requested a report listing the students' grade point averages (GPA) sorted from highest grade point average to lowest.
Which statement produces a report that displays the student ID and GPA in the sorted order requested by the registrar?
A. SELECT student_id, gpa FROM student_grades ORDER BY gpa ASC;
B. SELECT student_id, gpa FROM student_grades SORT ORDER BY gpa ASC;
C. SELECT student_id, gpa FROM student_grades SORT ORDER BY gpa;
D. SELECT student_id, gpa FROM student_grades ORDER BY gpa;
E. SELECT student_id, gpa FROM student_grades SORT ORDER BY gpa DESC;
F. SELECT student_id, gpa FROM student_grades ORDER BY gpa DESC;
Answer: F
Explanation:
sorted by highest to lowest is DESCENDING order
Incorrect Answer: Aresult in ascending order Bwrong syntax with SORT keyword Cwrong syntax with SORT keyword Ddefault value for ORDER by is in ascending order Ewrong syntax with SORT keyword
Refer: Introduction to Oracle9i: SQL, Oracle University Study Guide, 2-22
Q9. - (Topic 1)
You work as a database administrator at ABC.com. You study the exhibit carefully.
Exhibit:
You issue the following SQL statement:
Which statement is true regarding the execution of the above query?
A. It produces an error because the AMT_SPENT column contains a null value.
B. It displays a bonus of 1000 for all customers whose AMT_SPENT is less than CREDIT_LIMIT.
C. It displays a bonus of 1000 for all customers whose AMT_SPENT equals CREDIT_LIMIT, or AMT_SPENT is null.
D. It produces an error because the TO_NUMBER function must be used to convert the result of the NULLIF function before it can be used by the NVL2 function.
Answer: C
Explanation:
The NULLIF Function The NULLIF function tests two terms for equality. If they are equal the function returns a null, else it returns the first of the two terms tested. The NULLIF function takes two mandatory parameters of any data type. The syntax is NULLIF(ifunequal, comparison_term), where the parameters ifunequal and comparison_term are compared. If they are identical, then NULL is returned. If they differ, the ifunequal parameter is returned.
Q10. - (Topic 1)
Which two statements are true regarding the COUNT function? (Choose two.)
A. COUNT(*) returns the number of rows including duplicate rows and rows containing NULL value in any of the columns
B. COUNT(cust_id) returns the number of rows including rows with duplicate customer IDs and NULL value in the CUST_ID column
C. COUNT(DISTINCT inv_amt) returns the number of rows excluding rows containing duplicates and NULL values in the INV_AMT column
D. A SELECT statement using COUNT function with a DISTINCT keyword cannot have a WHERE clause
E. The COUNT function can be used only for CHAR, VARCHAR2 and NUMBER data types
Answer: A,C
Explanation:
Using the COUNT Function
The COUNT function has three formats:
COUNT(*)
COUNT(expr)
COUNT(DISTINCT expr)
COUNT(*) returns the number of rows in a table that satisfy the criteria of the SELECT
statement, including duplicate rows and rows containing null values in any of the columns.
If a WHERE clause is included in the SELECT statement, COUNT(*) returns the number of
rows that satisfy the condition in the WHERE clause.
In contrast,
COUNT(expr) returns the number of non-null values that are in the column identified by
expr.
COUNT(DISTINCT expr) returns the number of unique, non-null values that are in the
column identified by expr.
Q11. - (Topic 2)
Which two statements are true regarding constraints? (Choose two.)
A. A foreign key cannot contain NULL values.
B. A column with the UNIQUE constraint can contain NULL values.
C. A constraint is enforced only for the INSERT operation on a table.
D. A constraint can be disabled even if the constraint column contains data.
E. All constraints can be defined at the column level as well as the table level.
Answer: B,D
Explanation:
Including Constraints
.
Constraints enforce rules at the table level.
.
Constraints prevent the deletion of a table if there are dependencies.
.
The following constraint types are valid:
–
NOT NULL
–
UNIQUE
–
PRIMARY KEY
–
FOREIGN KEY
–
CHECK
Q12. - (Topic 2)
You want to display the date for the first Monday of the next month and issue the following command:
SQL>SELECT TO_CHAR(NEXT_DAY(LAST_DAY(SYSDATE),'MON'), 'dd "is the first Monday for"fmmonth rrrr') FROM DUAL;
What is the outcome?
A. It executes successfully and returns the correct result.
B. It executes successfully but does not return the correct result.
C. It generates an error because TO_CHAR should be replaced with TO_DATE.
D. It generates an error because rrrr should be replaced by rr in the format string.
E. It generates an error because fm and double quotation marks should not be used in the format string.
Answer: A
Explanation:
.
NEXT_DAY(date, 'char'): Finds the date of the next specified day of the week ('char') following date. The value of char may be a number representing a day or a character string.
.
LAST_DAY(date): Finds the date of the last day of the month that contains date The second innermost function is evaluated next. TO_CHAR('28-OCT-2009', 'fmMonth') converts the given date based on the Month format mask and returns the character string October. The fm modifier trims trailing blank spaces from the name of the month.
Q13. - (Topic 1)
Examine the structure of the EMPLOYEES and NEW_EMPLOYEES tables:
Which DELETE statement is valid?
A. DELETE FROM employeesWHERE employee_id = (SELECT employee_id FROM employees);
B. DELETE * FROM employeesWHERE employee_id=(SELECT employee_id FROM new_employees);
C. DELETE FROM employeesWHERE employee_id IN (SELECT employee_id FROM new_employees WHERE name = ‘Carrey’);
D. DELETE * FROM employeesWHERE employee_id IN (SELECT employee_id FROM new_employees WHERE name = ‘Carrey’);
Answer: C
Q14. - (Topic 2)
Evaluate this SQL statement:
SELECT ename, sal, 12*sal+100 FROM emp;
The SAL column stores the monthly salary of the employee. Which change must be made to the above syntax to calculate the annual compensation as "monthly salary plus a monthly bonus of $100, multiplied by 12"?
A. No change is required to achieve the desired results.
B. SELECT ename, sal, 12*(sal+100) FROM emp;
C. SELECT ename, sal, (12*sal)+100 FROM emp;
D. SELECT ename, sal+100,*12 FROM emp;
Answer: B
Explanation:
to achieve the result you must add 100 to sal before multiply with 12. Select ename, sal, 12*(sal+100) from EMP;
Incorrect Answer: AMultiplication and division has priority over addition and subtraction in Operator precedence. CGive wrong results DWrong syntax
Refer: Introduction to Oracle9i: SQL, Oracle University Study Guide, 1-11
Q15. - (Topic 1)
View the Exhibit and examine the structure of the PRODUCTS table.
All products have a list price.
You issue the following command to display the total price of each product after a discount of 25% and a tax of 15% are applied on it. Freight charges of S100 have to be applied to all the products.
What would be the outcome if all the parentheses are removed from the above statement?
A. It produces a syntax error.
B. The result remains unchanged.
C. The total price value would be lower than the correct value.
D. The total price value would be higher than the correct value.
Answer: B