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Oracle Database SQL Sample Questions (Q149-Q154):

NEW QUESTION # 149
Examine these statements:

Which two are true?

A. Both foreign key constraint definition must be removed from the CREATE statements, and be added with ALTER TABLE statements once both tables are created, for the two CREATE TABLE statements to execute successfully in the order shown.
B. The MGR column In the DEPT table will not be able to contain null values.
C. The DEPT_FKEY constraint definition must be removed from the CREATE TABLE DEPT statement. and the added with an D. ALTER statement once both tables are created, for the two CREATE TABLE statements to execute successfully in the order shown.
D. The create TABLE EMP statement must precede the create table DEPT statement for all three statements to execute successfully.
E. All three statements execute successfully in the order shown.
F. The DEPTNO column in the EMP table will be able to contain null values.

Answer: C,F

NEW QUESTION # 150
Examine the description or the BOOKS_TRANSACTIONS table:

FOR customers whose income level has a value, you want to display the first name and due amount as 5% of their credit limit. Customers whose due amount is null should not be displayed.
Which query should be used?

A. SELECT cust_first_name, cust_credit_limit * . 05 AS DUE AMOUNT
FROM customers
WHERE cust income_level IS NOT NULL
AND due_amount IS NOT NULL;
B. SELECT cust_first_name, cust_credit_limit * . 05 AS DUE AMOUNT
FROM customers
WHERE cust income_level !=NULL
AND cust credit_level !=NULL;
C. SELECT cust_first_name, cust_credit_limit * . 05 AS DUE AMOUNT
FROM customers
WHERE cust income_level <> NULL
AND due_amount <> NULL;
D. SELECT cust_first_name, cust_credit_limit * . 05 AS DUE AMOUNT
FROM customers
WHERE cust income_level !=NULL
AND due_amount !=NULL;
E. SELECT cust_first_name, cust_credit_limit * . 05 AS DUE AMOUNT
FROM customers
WHERE cust_income_level IS NOT NULL
AND cust_credit_limit IS NOT NULL;

Answer: E

NEW QUESTION # 151
Which two statements are true about sequences created in a single instance Oracle database? (Choose two.)

A. The numbers generated by an explicitly defined sequence can only be used to insert data in one table.
B. CURRVAL is used to refer to the most recent sequence number that has been generated for a particular sequence.
C. When the MAXVALUE limit for a sequence is reached, it can be increased by using the ALTER SEQUENCE statement.
D. DELETE <sequencename> would remove a sequence from the database.
E. When a database instance shuts down abnormally, sequence numbers that have been cached but not used are available again when the instance is restarted.

Answer: B,C

Explanation:
http://docs.oracle.com/cd/E11882_01/server.112/e41084/statements_2012.htm#SQLRF00817
https://docs.oracle.com/cd/A84870_01/doc/server.816/a76989/ch26.htm

NEW QUESTION # 152
Examine the business rule:
Each student can work on multiple projects and each project can have multiple students.
You need to design an Entity Relationship Model (ERD) for optimal data storage and allow for generating reports in this format:
STUDENT_ID FIRST_NAME LAST_NAME PROJECT_ID PROJECT_NAME PROJECT_TASK
Which two statements are true in this scenario? (Choose two.)

A. STUDENT_IDmust be the primary key in the STUDENTSentity and foreign key in the PROJECTSentity.
B. The ERD must have a 1:M relationship between the STUDENTSand PROJECTSentities.
C. The ERD must have a M:M relationship between the STUDENTSand PROJECTSentities that must be resolved into 1:M relationships.
D. PROJECT_IDmust be the primary key in the PROJECTSentity and foreign key in the STUDENTSentity.
E. An associative table must be created with a composite key of STUDENT_ID and PROJECT_ID, which is the foreign key linked to the STUDENTS and PROJECTS entities.

Answer: C,E

Explanation:
Explanation/Reference:
References:
http://www.oracle.com/technetwork/issue-archive/2011/11-nov/o61sql-512018.html

NEW QUESTION # 153
Which three statements are true about single-row functions?

A. They can be nested to any level.
B. They return a single result row per table.
C. They can be used only in the WHERE clause of a SELECT statement.
D. The argument can be a column name, variable, literal or an expression.
E. They can accept only one argument.
F. The data type returned can be different from the data type of the argument.

Answer: A,D,F

Explanation:
Single-row functions in SQL return one result per row, and the following statements are true:
A: The data type of the returned value can indeed be different from the data type of the argument provided to the function. For example, the TO_CHAR function can take a numeric input and return a character string.
B: Single-row functions can be nested within each other to any level that is supported by Oracle. This means you can have a function call as an argument to another function, and so on.
E: The argument to a single-row function can be a column name, a variable, a literal, or an expression. This flexibility allows these functions to be very powerful in SQL expressions.
The incorrect options are:
C: Single-row functions do not return a single result row per table; they return a result for each row that is processed.
D: They are not limited to accepting only one argument. Some functions, like NVL, accept multiple arguments.
F: They are not limited to use in the WHERE clause; single-row functions can be used in any part of a SQL statement, including SELECT and ORDER BY clauses.
Reference:
Oracle Documentation on Single-Row Functions: SQL Functions

NEW QUESTION # 154
......

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