Database Systems: Design, Implementation, & Management
11th Edition
ISBN: 9781285196145
Author: Steven, Steven Morris, Carlos Coronel, Carlos, Coronel, Carlos; Morris, Carlos Coronel and Steven Morris, Carlos Coronel; Steven Morris, Steven Morris; Carlos Coronel
Publisher: Cengage Learning
expand_more
expand_more
format_list_bulleted
Concept explainers
Expert Solution & Answer
Chapter 8, Problem 10RQ
Explanation of Solution
Difference between UNION and UNION ALL:
UNION | UNION ALL |
The UNION set operator is used to combine the output of two or more than two queries and produce a result. The produced result contains unique values. | The UNION ALL set operator is used to combine the output of two or more than two queries and produce a result. The produced result contains duplicate values. |
Syntax: QUERY UNION QUERY; | Syntax: QUERY UNION ALL QUERY; |
Example for UNION:
Consider two tables,
The table “T1(ID, fruit_name)” contains rows with values (1, 'Mango' ), (1, 'Orange' ), (3, 'Grapes' ).
The table “T2(ID, fruit_name)” contains rows with values (1, 'Mango' ), (1, 'Apple' ), (3, 'Grapes' )...
Expert Solution & Answer
Want to see the full answer?
Check out a sample textbook solutionStudents have asked these similar questions
Q:
This is an SQL question, which is correct:
Which of the following statements about JOINs are true?
a.
If NATURAL JOIN and FULL OUTER JOIN have the same number of rows, then LEFT OUTER JOIN AND RIGHT OUTER JOIN will not have the same number of rows.
b.
Number of rows in a NATURAL JOIN is always less than the number of rows in a FULL OUTER JOIN
c.
LEFT OUTER JOIN and RIGHT OUTER JOIN will always have the same number of rows
d.
Number of rows in a NATURAL JOIN can be equal to the number of rows in a FULL OUTER JOIN
e.
LEFT OUTER JOIN can produce more rows than FULL OUTER JOIN
Given the following ERD, which of the following joins produce the same results. You can assume the correct column is being specified in the USING clause for each join.
____ A LEFT JOIN B USING (ab) JOIN C USING (bc)
____ A LEFT JOIN B USING (ab) LEFT JOIN C USING (bc)
____ C JOIN B USING (bc) RIGHT JOIN A USING (ab)
What’s the difference between an equality and a non-equality join?
Chapter 8 Solutions
Database Systems: Design, Implementation, & Management
Ch. 8 - What is a cross join? Give an example of its...Ch. 8 - What three join types are included in the outer...Ch. 8 - Using tables named T1 and T2, write a query...Ch. 8 - Prob. 4RQCh. 8 - Prob. 5RQCh. 8 - Prob. 6RQCh. 8 - Prob. 7RQCh. 8 - What does it mean to say that SQL operators are...Ch. 8 - Prob. 9RQCh. 8 - Prob. 10RQ
Ch. 8 - Prob. 11RQCh. 8 - Prob. 12RQCh. 8 - Prob. 13RQCh. 8 - Given the employee information in Question 11,...Ch. 8 - Prob. 15RQCh. 8 - Prob. 16RQCh. 8 - Prob. 17RQCh. 8 - Prob. 18RQCh. 8 - What string function should you use to list the...Ch. 8 - Prob. 20RQCh. 8 - Prob. 21RQCh. 8 - Prob. 22RQCh. 8 - Prob. 23RQCh. 8 - Prob. 24RQCh. 8 - Prob. 1PCh. 8 - Insert the data into the tables you created in...Ch. 8 - Prob. 3PCh. 8 - Prob. 4PCh. 8 - Prob. 5PCh. 8 - Prob. 6PCh. 8 - Prob. 7PCh. 8 - Prob. 8PCh. 8 - Prob. 9PCh. 8 - Modify the CUSTOMER table to include two new...Ch. 8 - Prob. 11PCh. 8 - Prob. 12PCh. 8 - Prob. 13PCh. 8 - Prob. 14PCh. 8 - Prob. 15PCh. 8 - Prob. 16PCh. 8 - Write a trigger to update the customer balance...Ch. 8 - Write a procedure to delete an invoice, giving the...Ch. 8 - Prob. 19PCh. 8 - Prob. 20PCh. 8 - Prob. 21PCh. 8 - Prob. 22PCh. 8 - Prob. 23PCh. 8 - Prob. 24PCh. 8 - Prob. 25PCh. 8 - Prob. 26PCh. 8 - Prob. 27PCh. 8 - Create a trigger named trg_line_total to write the...Ch. 8 - Create a trigger named trg_line_prod that...Ch. 8 - Create a stored procedure named prc_inv_amounts to...Ch. 8 - Create a procedure named prc_cus_balance_update...Ch. 8 - Modify the MODEL table to add the attribute and...Ch. 8 - Prob. 33PCh. 8 - Modify the CHARTER table to add the attributes...Ch. 8 - Write the sequence of commands required to update...Ch. 8 - Write the sequence of commands required to update...Ch. 8 - Write the command required to update the...Ch. 8 - Write the command required to update the...Ch. 8 - Write the command required to update the...Ch. 8 - Prob. 40PCh. 8 - Create a trigger named trg_char_hours that...Ch. 8 - Create a trigger named trg_pic_hours that...Ch. 8 - Create a trigger named trg_cust_balance that...Ch. 8 - Alter the DETAILRENTAL table to include a derived...Ch. 8 - Alter the VIDEO table to include an attribute...Ch. 8 - Update the VID_STATUS attribute of the VIDEO table...Ch. 8 - Alter the PRICE table to include an attribute...Ch. 8 - Prob. 48CCh. 8 - Prob. 51C
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
- Explain the distinction between an inner and an outer join.arrow_forwardWhat are the main differences between Primary key and Unique Key?arrow_forwardExplain how the GROUP BY clause works. What is the difference between the WHERE and HAVING clauses? What is the difference between a subquery and a join? Under what circumstances would you not be able to use a subquery?arrow_forward
- Change these SQL query statements to XML Statements select distinct company_name from (employee natural join works) join company using (company_name) where employee.city = 'Omaha' or employee.city = 'Lincoln' select distinct street, employee.city from manages, employee natural join works where company_name = 'Union Pacific';arrow_forwardCan someone (using simple examples) tell me how to write an inner join, a left join, right join, and outer join? please use the 2 tables provided below for example. Please go through each join step by step and do each seperatlyarrow_forwardWhat is the difference between an inner join and outer join?arrow_forward
arrow_back_ios
SEE MORE QUESTIONS
arrow_forward_ios
Recommended textbooks for you
- Database Systems: Design, Implementation, & Manag...Computer ScienceISBN:9781305627482Author:Carlos Coronel, Steven MorrisPublisher:Cengage LearningDatabase Systems: Design, Implementation, & Manag...Computer ScienceISBN:9781285196145Author:Steven, Steven Morris, Carlos Coronel, Carlos, Coronel, Carlos; Morris, Carlos Coronel and Steven Morris, Carlos Coronel; Steven Morris, Steven Morris; Carlos CoronelPublisher:Cengage Learning
- A Guide to SQLComputer ScienceISBN:9781111527273Author:Philip J. PrattPublisher:Course Technology Ptr
Database Systems: Design, Implementation, & Manag...
Computer Science
ISBN:9781305627482
Author:Carlos Coronel, Steven Morris
Publisher:Cengage Learning
Database Systems: Design, Implementation, & Manag...
Computer Science
ISBN:9781285196145
Author:Steven, Steven Morris, Carlos Coronel, Carlos, Coronel, Carlos; Morris, Carlos Coronel and Steven Morris, Carlos Coronel; Steven Morris, Steven Morris; Carlos Coronel
Publisher:Cengage Learning
A Guide to SQL
Computer Science
ISBN:9781111527273
Author:Philip J. Pratt
Publisher:Course Technology Ptr