Refer to the sample tables and sample data below.Tables:adult (id(pk), name)child (id(pk), name)parent_child (parent (pk, fk), child (pk, fk))foreign key (parent) references adult(id)- foreign key (child) references child(id)mysql> SELECT * FROM adult;|id|name|1 | Homer Simpson.| 2 | Marge Simpson||||||3 | Fred Flintstone4 | Wilma Flintstone5 | George Jetson6 | Jane Jetson7 | Patty Bouvier8 | Selma Bouviermysql> SELECT * FROM child;|id|name| 11 | Bart| 12 | Lisa| 13 | Maggie| 14 |Pebbles| 15 | Judy| 16 | Elroy| 17 | Lingmysql> SELECT * FROM parent_child;| parent child |1 |2 |1 |21 |213 |45 |in 10 in65 |10001111121213 |131414 |815556615 |6 | 161716 | (a) How many rows will be returned by the following command? [Select]SELECT DISTINCT a.name FROM adult aLEFT JOIN parent_child pc ON a.id = pc.parentLEFT JOIN child c ON pc.child = c.id;(b) How many rows will be returned by the following command? [Select]SELECT DISTINCT a.name FROM adult aRIGHT JOIN parent_child pc ON a.id = pc.parentRIGHT JOIN child c ON pc.child = c.id;

Please find the answer in the following steps.

(a) How many rows will be returned by the following command? [Select] SELECT DISTINCT a.name FROM adult a LEFT JOIN parent_child pc ON a.id = pc.parent LEFT JOIN child c ON pc.child = c.id; (b) How many rows will be returned by the following command? [Select] SELECT DISTINCT a.name FROM adult a RIGHT JOIN parent_child pc ON a.id = pc.parent RIGHT JOIN child c ON pc.child = c.id; <

(a) How many rows will be returned by the following command? [Select] SELECT DISTINCT a.name FROM adult a LEFT JOIN parent_child pc ON a.id = pc.parent LEFT JOIN child c ON pc.child = c.id; (b) How many rows will be returned by the following command? [Select] SELECT DISTINCT a.name FROM adult a RIGHT JOIN parent_child pc ON a.id = pc.parent RIGHT JOIN child c ON pc.child = c.id; <

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

See similar textbooks

Related questions

Q: What is the output of the following command: pd.merge(dataframe_employees, dataframe_sales,…

A: Given:

Q: What does it mean to say that the select statements for two tables are union compatible? Question…

A: Relational algebra operators: The relational algebra operators that can be applied to a pair of…

Q: .Here is ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds…

A: The error in the question lies in the show database command.

Q: Some rows of a User table are shown below: User ucode name phone scode 7 Alex 847 - 3902…

A: Names and phone numbers are among the details about different users that are included in the User…

Q: The script: $Services = Read-Host "Please provide the name of the service you want to see…

A: Solution below contains the error description,Corrected code screenshot and Output Line One Error -…

Q: The Car Maintenance team wants to update the price of Oil Change to 75. In addition, they will no…

A: We need to write the MYSQL query to update the price of Oil Change to 75 and remove the maintenance…

Q: Create the UPDATE_INVOICE procedure to change the date of the invoice whose number is stored in…

A: It enables to save query with a name so that it can be executed whenever required rather than…

Q: Write a script that creates and calls a stored procedure named insert_category. First, code a…

A: The question requires us to write a script that creates and calls a stored procedure named…

Q: Which of the following statements places a shared lock on at least a portion of a table named…

A: Explanation: A shared lock on a resource means that resource is open for write operation only by…

Q: Write an Anonymous PL/SQL block that will insert five records into the database; the records must…

A: pls find the attached solution of the given question:

Q: What value will return when the last SQL statement is executed?

A: When the last SQL statement is executed 3 will be returned.

Q: If you want to create a Cartesian product, simply do not join the tables in an SQL query statement.…

A: A) Executing SQL script file To execute commands residing in a file, type the following command:…

Q: Find a Pandas function that can be used to remove columns based on the column name. Store the…

A: Given: # Removing columns# Remove the 'cubicinches', 'weight lbs', 'brand ' columns#Store the…

Q: Question 7 Match a user request with the correct Express handler 1. app out product, fu Anna needs…

A: Lets see the solution.

Q: SQL Commands Tables sec0410_data2 and sec0410_data1 have the same record structure. Each row has…

A: We can put data using - insert into select statement This statement copies data from one table and…

Q: 1-Create 5 to 7 instances for each table to write the INSERT INTO STATEMENT ?

A: Creating table and inserting the records. 1-Create 5 to 7 instances for each table to write the…

Q: For all questions, you can assume that the following $() function is available: const $ = selector…

A: DOM: The DOM (Document Object Model) is a programming interface for web documents. It represents the…

Q: write Command to insert data into this tables create table patients ( patient_id VARCHAR(255),…

A: Hi Student Warm Welcome from my side. Hope you are doing great. Here's your required answer.

Q: Lab 8-1: KimTay Pet Supplies Task 6: Create the GET_INVOICE_DATE procedure to obtain the customer…

A: GET_INVOICE_DATE procedure: CREATE PROCEDURE GET_INVOICE_DATE @INVOICE_NUM nvarchar(10) AS SELECT…

Q: Task 4: KimTay Pet Supplies is running a promotion that is valid for up to 20 days after an order is…

A: Here, we are using dateadd function to add 20 days into the invoice date the day today function…

Q: 10. Which of the following is not an example of single value attribute of a person? a. gender b.…

A: Answer 10:- The correct answer is " date of birth " Explanation:- Therefore, age of a person is a…

Q: Create a view name TopLevelCust view. It consists of the number, name, address, balance, and credit…

A: SQL view: The views are virtual/ logical table that is used to view or manipulate parts of the…

Q: Which of the following is the proper way to create an alias, E, for relational table Employee and…

A: SOLUTION -The correct answer is - (c) SELECT * FROM EMPLOYEE E;Below is the explanation-

Q: Refer to the sample tables and sample data below. Then answer questions (a), (b), (c), and (d).…

A: We need to find the output of the given MySQL statements.

Concept explainers

SQL

SQL stands for Structured Query Language, is a form of communication that uses queries structured in a specific format to store, manage & retrieve data from a relational database.

Queries

A query is a type of computer programming language that is used to retrieve data from a database. Databases are useful in a variety of ways. They enable the retrieval of records or parts of records, as well as the performance of various calculations prior to displaying the results. A search query is one type of query that many people perform several times per day. A search query is executed every time you use a search engine to find something. When you press the Enter key, the keywords are sent to the search engine, where they are processed by an algorithm that retrieves related results from the search index. Your query's results are displayed on a search engine results page, or SER.

Question

Refer to the sample tables and sample data below.
Tables:
adult (id(pk), name)
child (id(pk), name)
parent_child (parent (pk, fk), child (pk, fk))
foreign key (parent) references adult(id)
- foreign key (child) references child(id)
mysql> SELECT * FROM adult;
|id|name
|
1 | Homer Simpson.
| 2 | Marge Simpson
|
|
|
|
|
|
3 | Fred Flintstone
4 | Wilma Flintstone
5 | George Jetson
6 | Jane Jetson
7 | Patty Bouvier
8 | Selma Bouvier
mysql> SELECT * FROM child;
|id|name
| 11 | Bart
| 12 | Lisa
| 13 | Maggie
| 14 |
Pebbles
| 15 | Judy
| 16 | Elroy
| 17 | Ling
mysql> SELECT * FROM parent_child;
| parent child |
1 |
2 |
1 |
2
1 |
21
3 |
4
5 |
in 10 in
6
5 |
1000
11
11
12
12
13 |
13
14
14 |
8
15
5566
15 |
6 | 16
17
16 |

(a) How many rows will be returned by the following command? [Select]
SELECT DISTINCT a.name FROM adult a
LEFT JOIN parent_child pc ON a.id = pc.parent
LEFT JOIN child c ON pc.child = c.id;
(b) How many rows will be returned by the following command? [Select]
SELECT DISTINCT a.name FROM adult a
RIGHT JOIN parent_child pc ON a.id = pc.parent
RIGHT JOIN child c ON pc.child = c.id;

Expert Solution

This question has been solved!

Explore an expertly crafted, step-by-step solution for a thorough understanding of key concepts.

SEE SOLUTION Check out a sample Q&A here

Step 1

VIEW

Step 2

VIEW

Step 3

VIEW

Step by step

Solved in 3 steps with 2 images

SEE SOLUTION Check out a sample Q&A here

Knowledge Booster

Learn more about

Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, computer-science and related others by exploring similar questions and additional content below.

Similar questions

Task 2: ' The Driver Relationship team wants to ensure that the all driving license IDs in the active drivers table have the length of 7. Alter the ACTIVE_DRIVERS table created in Chapter 8, Activity 1 to check the length of the DRIVER_DRIVING_LICENSE_ID.
Which of the following is a correct statement?a. A commit is issued implicitly when a user exits SQL Developer or SQL*Plus.b. A commit is issued implicitly when a DDL command is executed.c. A commit is issued automatically when a DML command is executed.d. All of the above are correct.e. Both a and b are correct.f. Both a and c are correct
- Create a trigger that will insert new emp_no, salary, from_date and to_date into salaries table after a new employee record is inserted. Assume the new employee salary is 10000 and from_date is current date and to_date is “9999-01-01” - List the employees’ first names and salaries where their salary is above the average salary among the employees
Task 3: The InstantRide Finance team wants to collect the price and discount information with the driver names for each travel in the system. You need to return the TRAVEL_ID, DRIVER_FIRST_NAME, DRIVER_LAST_NAME, TRAVEL_PRICE, and TRAVEL_DISCOUNT information from the TRAVELS and DRIVERS tables combined over DRIVER_ID field with the ON keyword. Task: Calculate each user's price and discount information. (SQL Database Test)
Create a user Nurse. (Screenshot 1) Create a database Hospital. (Screenshot 2) Grant Nurse privileges to Hospital (Screenshot 3) As Nurse, create a table Patients with the following structure. (Screenshot 4) PatientID RoomNo FirstName LastName Admission Temperature double(10,2) int(8) Primary Key and not null int(4) varchar(14) not null varchar(14) not null datetime Use a command to describe the table(Screenshot 5) Insert 2 patients randomly to the above table(Screenshot 6) Show all the contents of the table. (Screenshot 7)
What is the most efficient way to write a trigger that updates a large number of rows? Specify "for each statement" Specify "for each row" Specify "for each table" Specify "referencing new row"
Insert the following records into their corresponding tables, using the MySQL CLI. Take a screenshot of a Select * command being successfully executed on each table (6 total). School School Number Name Address PhoneNumber built size 54 John Adams High School 8226 Selby Lane 5056444088 2012-12-13 118500 45 Hogwarts School of Witchcraft and Wizardry 738 North Williams Ave. 5056448362 2001-11-14 414000 119 Dillon High School 475 South University Ave. 5058672818 2006-10-03 102598 345 Green Dale High 772 Grand St. 5056624410 2009-09-17 250345 93 Bayside High 7914 Aspen Drive 5057756575 2000-08-20 175645
Insert the following records into their corresponding tables, using the MySQL CLI. Take a screenshot of a Select * command being successfully executed on each table (6 total). Administrator employeeNumber SchoolNumber firstname lastName phoneNumber officeNumber 4 45 Albus Dumbledore 2072087222 201 60 45 Minerva McGonagall 2406994295 150 119 45 Percy Weasley 4324061884 302 138 345 Ken Jeong 5058091461 503 52 345 Jim Rash 4173119531 654 16 345 John Oliver 4255510706 321 25 93 Dennis Haskins 5056465505 987 146 93 Hayley Mills 5056443920 852 101 93 Joan Ryan 5056444527 963 172 119 Eric Taylor 4197627238 741 89 119 Tami Taylor 5056449431 159 76 119 Matt Saracen 5058813720 753 193 54 George Feeny 2136699130 456 77 54 Jonathan Turner 5056833823 789 24 54 Eli Williams…
EXAMINE THE TRIGGER BELOW IS IT CORRECT? IF NOT MODIFY Create test to show that the triggers are correctly implemented, do the following: Truncate the Transaction table Reset the Tx_Nbr sequence back to 1 Update the Account table, setting the Balance back to zero Re-run the INSERT statements for the transactions Use simple queries to demonstrate that the results in the Transaction and Account tables are as expected GIVEN THE TRIGGER BELOW: Trigger to enforce the referential integrity for the Transaction Ref_Nbr: Deposit or Withdrawal transaction to Bank Branch Bill Payment, Debit Purchase, or Return transaction to Merchant CREATE TRIGGER Transaction_RefNbr_Check BEFORE INSERT OR UPDATE ON Transactions FOR EACH ROW DECLARE TxRefNbr_count INTEGER; BEGIN IF:NEW.TxTypeCode = ‘D’ OR :NEW.TxTypeCode = ‘W’ THEN SELECT COUNT(*)INTO TxRefNbr_count FROM BRANCH WHERE BranchNbr=:NEW.RefNbr; IF TxRefNbr_count = 0 THEN…
q20- Choose ALL that apply.
You have a table that contains the following fields: Last Name, First Name, Street, City, State, and Postal Code. There are 50,000 records in the table. What indexes would you create for the table? You have a table that contains the following fields: Book ISBN Number, Book Title, Author Last Name, Author First Name, Publication Year, and Publisher Name. There are 75,000 records in the table. What indexes would you create for the table?
Which of the following is a correct statement?a. If you attempt to add a record that violates a constraint for one of the table’s columns, only the valid columns for the row are added.b. A subquery nested in the VALUES clause of an INSERT INTO command can return only one value without generating an Oracle 12c error message.c. If you attempt to add a record that violates a NOT NULL constraint, a blank space is inserted automatically in the appropriate column so that Oracle 12c can complete the DML operation.d. None of the above statements is correct.