Test: Quiz: Insert Statement

Section 1

1. What is the quickest way to use today's date when you are creating a new row? Mark for Review
(1) Points


Simply write today's date in the format of 'dd-mon-rr'.


Simply use the keyword DATE in the insert statement.


Use the SYSDATE function. (*)


Use the TODAYS_DATE function.






2. When inserting rows into a table all columns must be given values. True or False? Mark for Review
(1) Points


True


False (*)






3. To return a table summary on the customers table, which of the following is correct? Mark for Review
(1) Points


SHOW customers, or SEE customers


DISTINCT customers, or DIST customers


DESCRIBE customers, or DESC customers (*)


DEFINE customers, or DEF customers






4. If the employees table have 7 rows how many rows are inserted into the copy_emps table with the following statement:

INSERT INTO copy_emps (employee_id, first_name, last_name, salary, department_id)
SELECT employee_id, first_name, last_name, salary, department_id
FROM employees
Mark for Review
(1) Points


No rows, as you cannot use subqueries in an insert statement.


7 rows, as there is no WHERE-clause on the subquery. (*)


No rows, as the SELECT statement is invalid.


10 rows will be created.






5. Is it possible to insert more than one row at a time using an INSERT statement with a VALUES clause? Mark for Review
(1) Points


No, you can only create one row at a time when using the VALUES clause. (*)


Yes, you can just list as many rows as you want, just remember to separate the rows with commas.


No, there is no such thing as INSERT ... VALUES.






6. Which of the following statements will add a new customer to the customers table in the Global Fast Foods database? Mark for Review
(1) Points


INSERT IN customers (id, first_name, last_name, address, city, state, zip, phone_number);



INSERT INTO customers (id, first_name, last_name, address, city, state, zip, phone_number)
VALUES ("145", 'Katie', 'Hernandez', '92 Chico Way', 'Los Angeles', 'CA', "98008", "8586667641");



INSERT INTO customers (id, first_name, last_name, address, city, state, zip, phone_number)
VALUES (145, 'Katie', 'Hernandez', '92 Chico Way', 'Los Angeles', 'CA', 98008, 8586667641);

(*)


INSERT INTO customers
(id 145, first_name 'Katie', last_name 'Hernandez', address '92 Chico Way', city 'Los Angeles', state 'CA', zip 98008, phone_number 8586667641);







7. When inserting a new row the null keyword can be included in the values list for any null column. True or False? Mark for Review
(1) Points


True (*)


False






8. DML is an acronym that stands for: Mark for Review
(1) Points


Debit Markup Language


Don't Manipulate Language


Data Markup Language


Data Manipulation Language (*)






9. Insert statements can be combined with subqueries to create more than one row per statement. True or False? Mark for Review
(1) Points


True (*)


False

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Test: Quiz: Using SET Operators

Section 1

1. The difference between UNION and UNION ALL is Mark for Review
(1) Points


There is no difference between, you get exactly the same result.


UNION will remove duplicates, UNION ALL returns all rows from all queries (*)


UNION ALL is like a NATURAL JOIN


UNION is a synomym for UNION ALL






2. MINUS will give you rows from the first query not present in the second query? (True or False) Mark for Review
(1) Points


True (*)


False






3. INTERSECT will give you rows found in both queries? (True or False) Mark for Review
(1) Points


True (*)


False






4. Which ones of the following are correct SET operators? (choose two) Mark for Review
(1) Points

(Choose all correct answers)


UNION, MINUS (*)


UNION ALL, PLUS ALL


UNION ALL, INTERSECT (*)


MINUS, PLUS

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Test: Quiz: Correlated Subqueries

Section 1

1. In a correlated subquery the outer and inner query are joined on one or more columns? (True or False) Mark for Review
(1) Points


True (*)


False






2. Table aliases must be used when you are writing correlated subqueries? (True or false) Mark for Review
(1) Points


True (*)


False






3. Correlated Subqueries must work on the same tables in both the inner and outer query? (True or False) Mark for Review
(1) Points


True


False (*)






4. The WITH-clause is a way of creating extra tables in the database? (True or False) Mark for Review
(1) Points


True


False (*)





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Test: Quiz: Multiple-Row Subqueries

Section 1

1. The SQL multiple-row subquery extends the capability of the single-row syntax through the use of what three comparison operators? Mark for Review
(1) Points


IN, ANY and EQUAL


IN, ANY and ALL (*)


IN, ANY and EVERY


IN, ALL and EVERY






2. There can be more than one subquery returning information to the outer query. True or False? Mark for Review
(1) Points


True (*)


False






3. The salary column of the f_staffs table contains the following values:
4000
5050
6000
11000
23000

Which of the following statements will return the last_name and first_name of those employees who earn more than 5000.
Mark for Review
(1) Points


SELECT last_name, first_name
FROM f_staffs
WHERE salary = (SELECT salary FROM f_staffs WHERE salary > 5000);



SELECT last_name, first_name
FROM f_staffs
WHERE salary = (SELECT salary FROM f_staffs WHERE salary <>



SELECT last_name, first_name
FROM f_staffs
WHERE salary IN (SELECT salary FROM f_staffs WHERE salary > 5000);

(*)


SELECT last_name, first_name
FROM f_staffs
WHERE salary IN
(SELECT last_name, first_name FROM f_staffs WHERE salary < 5000);







4. Multiple-row subqueries must have NOT, IN or ANY in the WHERE clause of the inner query. True or False? Mark for Review
(1) Points


True


False (*)






5. When a multiple-row subquery uses the NOT IN (<>ALL) operator, if one of the values returned by the inner query is a null value, the entire query returns: Mark for Review
(1) Points


A list of Nulls


All rows that were selected by the inner query including the null value(s)


All rows, minus the null value(s), that were selected by the inner query


No rows returned (*)






6. Group functions, such as HAVING and GROUP BY can be used in multiple-row subqueries. True or False? Mark for Review
(1) Points


True (*)


False






7. In a subquery the ALL operator compares a value to every value returned by the inner query. True or False? Mark for Review
(1) Points


True (*)


False






8. Group functions can be used in subqueries even though they may return many rows. True or False? Mark for Review
(1) Points


True (*)


False





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Test: Quiz: Single-Row Subqueries

Section 1

1. Subqueries are limited to four per SQL transaction. True or False? Mark for Review
(1) Points


True


False (*)






2. In a non-correlated subquery, the outer query always executes prior to the inner query's execution. True or False? Mark for Review
(1) Points


True


False (*)






3. Single row subqueries may not include this operator: Mark for Review
(1) Points


ALL (*)


=


<>


>






4. The result of this statement will be:

SELECT last_name, job_id, salary, department_id
FROM employees
WHERE job_id =
(SELECT job_id
FROM employees
WHERE employee_id = 141) AND department_id =
(SELECT department_id
FROM departments
WHERE location_id =1500)
Mark for Review
(1) Points


All employees from Location 1500 will be displayed


An error since you canﾒt get data from two tables in the same subquery


All employees with the department id of 141


Only the employees whose job id matches employee 141 and who work in location 1500 (*)






5. If the subquery returns no rows will the outer query return any values? Mark for Review
(1) Points


No, because you are not allowed to not return any rows from a subquery


Yes. It will just run and ignore the subquery


No, because the subquery will be treated like a null value. (*)


Yes, Oracle will find the nearest value and rewrite your statement implicitly when you run it






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Test: Quiz: Subqueries

Section 1

1. What will the following statement return:

SELECT employee_id, last_name
FROM employees
WHERE salary =
(SELECT MIN(salary)
FROM employees
GROUP BY department_id);

Mark for Review
(1) Points


Nothing. It is an invalid statement. (*)


A list of last_names and salaries of employees


A list of first_names and salaries of employees in Department 50


A list of last_names and salaries of employees grouped by department_id.






2. What will the following statement return:

SELECT last_name, salary
FROM employees
WHERE salary < (SELECT salary
FROM employees
WHERE employee_id = 103)
Mark for Review
(1) Points


A list of last_names and salaries of employees that makes more than employee 103


A list of last_names and salaries of employees that makes less than employee 103 (*)


A list of first_names and salaries of employees making less than employee 103


Nothing. It is an invalid statement.






3. What will the following statement return:

SELECT last_name, salary
FROM employees
WHERE (department_id, job_id) IN (SELECT (department_id, job_id)
FROM employees
WHERE employee_id = 103)
Mark for Review
(1) Points


A list of last_names and salaries of employees that works in the same department and has the same job_id as that of employee 103. (*)


A list of last_names or salaries of employees that works in the same department and has the same job_id as that of employee 103.


A list of last_names and salaries of employees that works in the same department or has the same job_id as that of employee 103.


Nothing. It is an invalid statement.






4. Which of the following statements is a true guideline for using subqueries? Mark for Review
(1) Points


Do not enclose the subquery in parentheses.


Place the subquery on the left side of the comparison condition.


The outer and inner queries can reference more than one table. They can get data from different tables. (*)


Only one WHERE clause can be used for a SELECT statement, and if specified, it must be the outer query.






5. Subqueries can only be placed in the WHERE clause. True or False? Mark for Review
(1) Points


True


False (*)






6. Examine the following statement:

SELECT last_name, salary
FROM employees
WHERE department_id = (SELECT department_id
FROM employees
WHERE employee_id = 103) AND job_id = (SELECT job_id
FROM employees
WHERE employee_id = 103)

Is this a pair-wise or non-pair-wise Subquery?
Mark for Review
(1) Points


This is an example of a non-pair-wise subquery. (*)


This is an example of a pair-wise subquery.


Neither. This statement is illegal, and will not run.






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Test: Quiz: Group By and Having Clauses, ROLLUP and CUBE Operations, and Grouping Sets

Section 1

1. Which of the following SQL statements could display the number of people with the same last name: Mark for Review
(1) Points


SELECT first_name, last_name, COUNT(employee_id)
FROM EMPLOYEES
GROUP BY last_name;



SELECT employee_id, COUNT(last_name)
FROM EMPLOYEES
GROUP BY last_name;



SELECT last_name, COUNT(last_name)
FROM EMPLOYEES
GROUP BY last_name;

(*)


SELECT employee_id, DISTINCT(last_name)
FROM EMPLOYEES
GROUP BY last_name;







2. The use of GROUP BY GROUPING SETS(....) can speed up the execution of complex report statements? (True or False) Mark for Review
(1) Points


True (*)


False






3. The following is a valid statement:

SELECT MAX(AVG(salary))
FROM employees
GROUP BY department_id;

True or False?
Mark for Review
(1) Points


True (*)


False






4. Read the following SELECT statement. Choose the column or columns that must be included in the GROUP BY clause.

SELECT COUNT(last_name), grade, gender
FROM STUDENTS
GROUP_BY ?????;
Mark for Review
(1) Points


last_name


last_name, grade


grade, gender (*)


last_name, gender






5. Examine the following statement:

SELECT department_id, manager_id, job_id, SUM(salary)
FROM employees
GROUP BY GROUPING SETS((department_id, manager_id), (department_id, job_id))

What data will this query generate?

Mark for Review
(1) Points


Total salaries for (department_id, job_id) and (department_id, manager_id) (*)


Total salaries for (department_id, job_id, manager_id)


Total for (job_id, manager_id)


The statement will fail.






6. If you want to include subtotals and grant totals for all columns mentioned in a GROUP BY clause you should use which of the following extensions to the GROUP BY clause? Mark for Review
(1) Points


ROLLUP


CUBE (*)


GROUP BY ALL COLUMNS


HAVING






7. Is the following statement correct?

SELECT department_id, AVG(salary)
FROM employees;

Mark for Review
(1) Points


No, because a GROUP BY department_id clause is needed (*)


No, because the SELECT clause cannot contain both individual columns and group functions


No, because the AVG function cannot be used on the salary column


Yes






8. Examine the following statement:

SELECT department_id, manager_id, job_id, SUM(salary)
FROM employees
GROUP BY GROUPING SETS(.......);

Select the correct GROUP BY GROUPING SETS clause from the following list:

Mark for Review
(1) Points


GROUP BY GROUPING SETS (department_id, AVG(salary)), (department_id, job_id), (department_id, manager_id)


GROUP BY GROUPING SETS (department_id, salary), (department_id, job_id), (department_id, manager_id)


GROUP BY GROUPING SETS ((department_id, manager_id), (department_id, job_id), (manager_id, job_id)) (*)


GROUP BY GROUPING SETS ((department_id, manager_id), (department_id, SUM(salary), (manager_id, job_id))






9. How would you alter the following query to list only employees where more than one employee exists with the same last_name:

SELECT last_name, COUNT(employee_id)
FROM EMPLOYEES
GROUP BY last_name;

Mark for Review
(1) Points


SELECT last_name, COUNT(employee_id)
FROM EMPLOYEES
WHERE COUNT(*) > 1
GROUP BY last_name



SELECT last_name, COUNT(last_name)
FROM EMPLOYEES
GROUP BY last_name
HAVING COUNT(last_name) > 1;

(*)


SELECT last_name, COUNT(last_name)
FROM EMPLOYEES
GROUP BY last_name
EXISTS COUNT(last_name) > 1;



SELECT employee_id, DISTINCT(last_name)
FROM EMPLOYEES
GROUP BY last_name
HAVING last_name > 1;







10. Is the following statement correct:

SELECT first_name, last_name, salary, department_id, COUNT(employee_id)
FROM employees
WHERE department_id = 50
GROUP BY last_name, first_name, department_id;

Mark for Review
(1) Points


Yes


No, beause you cannot have a WHERE-clause when you use group functions.


No, because the statement is missing salary in the GROUP BY clause (*)


Yes, because Oracle will correct any mistakes in the statement itself






11. Examine the following statement:

SELECT department_id, manager_id, job_id, SUM(salary)
FROM employees
GROUP BY ROLLUP(department_id, manager_id)

What extra data will this query generate?

Mark for Review
(1) Points


Subtotals for department_id, and grand totals for salary.


Subtotals for department_id, job_id and grand totals for salary.


Subtotals for department_id, job_id, manager_id and grand totals for salary.


The statement will fail. (*)






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