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
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Chapter 8, Problem 7RQ
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Difference between regular subquery and correlated subquery:
| Regular subquery |
Correlated subquery |
| The subquery is a query that is placed inside another SQL query and also embedded inside the “WHERE” clause. |
In a SQL language, the values of correlated subquery used for the outer query. It is implemented once for each row in the outer query. |
|
The first statement in the SQL is called as outer query and the second statement in the SQL is called as outer query. |
The correlated subquery is depended by the outer query. |
|
It is also called as inner query or nested query. | It is also called as repeating subquery or synchronized subquery... |
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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
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- Is there a distinct difference between subqueries correlated and uncorrelated?arrow_forwardWhat happens if a subquery with a single row produces several rows of results?arrow_forwardIf a subquery is used in the FROM clause of a query, how are the subquery’s results referenced in other clauses of the query?arrow_forward
- What is a Correlated subquery?arrow_forwardConsidering Vaccination Database, write queries to: Display the Subject CNIC, Name, Contact, Dose1 Center, and Dose2 Center as shown below: CNIC Name Contact Dose1 Center Dose2 Center 22401-6645321-1 Nasir 3409991112 Lachi Kohat 2 14301-6045321-5 Shahab 3409991112 kohat 3 Dara The subjects who have been vaccinated different types in Dose1 and Dose2. For instance, subjects who were vaccinated ‘Sinovac’ in the first dose, while Pfizer in the second dose.How many Viles of each type have been consumed so far. How many subjects are vaccinated from expired viles. Suggest the name of Incharge for the best performance award based on the highest number of subjects vaccinated on a single dayarrow_forwardWrite an SQL query that uses a multiple-column subquery in a FROM clause. Explain what the query is intended to do. Write an SQL query that is based on multiple tables and uses a subquery with the GROUP BY statement and HAVING clause. Explain what the query is intended to do. Write an SQL query that is based on multiple tables and uses a multiple-row subquery in a WHERE clause. The subquery will include the GROUP BY statement and another multiple-row subquery in a HAVING clause. Explain what the query is intended to do. Write an SQL query that joins three tables and uses any type of a subquery. Explain what the query is intended to do. Write an SQL query that is based on multiple tables and uses the DECODE function. Explain what the query is intended to do.arrow_forward
- How do you compose a subquery in SQL where you are searching for the most common value in one column for a specific value from another column (i.e. looking for the down where most penalties occur --> down is a column and PlayType is a column with penalties as a value). The columns are in the same table.arrow_forwardWhat is the difference between a subquery and a JOIN?arrow_forwardWrite SQL codes according to the requirements given. Tables are imaginary, column names can be made up. List the item ID, description, and category for each pair of items that are in the same category. (For example, one such pair would be item FS42 and item PF19, because the category for both items is FSH.) List the invoice number and invoice date for each invoice created for the customer James Gonzalez. Use a subquery to find the sales rep ID, first name, and last name of each sales rep who represents at least one customer with a credit limit of $500. List each sales rep only once in the results.arrow_forward
- Discuss the differences between a regular subquery and a correlated subquery. Provide an example of one or both subqueries.arrow_forwardTHIS MODULE IS ABOUT SUBQUERIES, SO YOU MUST USE SUBQUERIES INSTEAD OF TABLE JOINS (a) From which two fields in which table can you calculate the enrollment of a section?(b) From which table can you get both course and section numbers?(c) Which field in table SECTION uniquely identifies a section, section id or section no?(d) Write a SQL statement to show sections and their enrollment.(e) Write a SQL statement to show sections with enrollment greater than five. Display both course andsection numbersarrow_forwardWrite the SQL code to find the average Assign_Charge by Job_code from the Assignment table. Write the SQL code to find the average Assign_Charge by employee from the Assignment table. Write the SQL code to find who works the most and the least with one’s charging_hour from the Assignment table. Write the SQL code to find how many employees are in job_code 501. Write the SQL code to find what is the job description of job_code 507 Write the SQL codes to find how many projects are available.arrow_forward
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