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Q1. You issue the following command to alter the country column in the departments table: Which statement is true?
A. It produces an error because column definitions cannot be altered to add default values.
B. It executes successfully and all the rows that have a null value for the country column will be updated with the value 'USA'.
C. It executes successfully. The modification to add the default value takes effect only from subsequent insertions to the table.
D. It produces an error because the data type for the column is not specified.
Answer: B
Q2. You need to display the first names of all customers from the customers table that contain the character 'e' and have the character 'a' in the second last position.
Which query would give the required output?
A. Option A
B. Option B
C. Option C
D. Option D
Answer: A
Explanation:
The SUBSTR(string, start position, number of characters) function accepts three parameters and returns a string consisting of the number of characters extracted from the source string, beginning at the specified start position:
substr('http://www.domain.com', 12, 6) = domain
The position at which the first character of the returned string begins.
When position is 0 (zero), then it is treated as 1.
When position is positive, then the function counts from the beginning of string to find the first character.
When position is negative, then the function counts backward from the end of string. substring_length
The length of the returned string. SUBSTR calculates lengths using characters as defined by the input character set. SUBSTRB uses bytes instead of characters. SUBSTRC uses
Unicode complete characters.
SUBSTR2 uses UCS2 code points. SUBSTR4 uses UCS4 code points.
When you do not specify a value for this argument, then the function
The INSTR(source string, search item, [start position], [nth occurrence of search item]) function returns a number that represents the position in the source string, beginning from the given start position, where the nth occurrence of the search item begins:
instr('http://www.domain.com', '.', 1, 2) = 18
Q3. Which two statements are true regarding constraints?
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
Q4. You issue the following command to drop the products table:
SQL> DROP TABLE products;
Which three statements are true about the implication of this command?
A. All data along with the table structure is deleted.
B. A pending transaction in the session is committed.
C. All indexes on the table remain but they are invalidated.
D. All views and synonyms remain but they are invalidated.
E. All data in the table is deleted but the table structure remains.
Answer: A,B,D
Q5. You need to list the employees in DEPARTMENT_ID 30 in a single row, ordered by HIRE_DATE.
Examine the sample output:
Which query will provide the required output?
A. Option A
B. Option B
C. Option C
D. Option D
Answer: B
Reference: http://docs.oracle.com/cd/E11882_01/server.112/e10592/functions089.htm
Q6. You need to create a table with the following column specifications:
1. Employee ID (numeric data type) for each employee
2. Employee Name (character data type) that stores the employee name
3. Hire date, which stores the date of joining the organization for each employee
4. Status (character data type), that contains the value 'active1 if no data is entered
5. Resume (character large object [CLOB] data type), which contains the resume submitted by the employee
Which is the correct syntax to create this table?
A. Option A
B. Option B
C. Option C
D. Option D
Answer: D
Explanation:
CLOB Character data (up to 4 GB)
NUMBER [(p, s)] Number having precision p and scale s (Precision is the total number of decimal digits and scale is the number of digits to the right of the decimal point; precision can range from 1 to 38, and scale can range from –84 to 127.)
Q7. View the Exhibits and examine the structures of the products, sales, and customers tables.
You need to generate a report that gives details of the customer's last name, name of the product, and the quantity sold for a customers in 'Tokyo'.
Which two queries give the required result?
A. Option A
B. Option B
C. Option C
D. Option D
Answer: A,C
Q8. You execute the following commands:
For which substitution variables are you prompted for the input?
A. None, because no input required
B. Both the substitution variables 'hiredate' and 'mgr_id
C. Only 'hiredate'
D. Only 'mgr_id'
Answer: B
Q9. Examine the structure of the products table:
You want to display the names of the products that have the highest total value for UNIT_PRICE * QTY_IN_HAND.
Which SQL statement gives the required output?
A. Option A
B. Option B
C. Option C
D. Option D
Answer: A
Q10. Which three tasks can be performed using SQL functions built into Oracle Database?
A. Displaying a date in a nondefault format
B. Finding the number of characters in an expression
C. Substituting a character string in a text expression with a specified string
D. Combining more than two columns or expressions into a single column in the output
Answer: A,B,C
