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 11, Problem 14P
Problems 11–14 are based on the following query:
| SELECT | P_CODE, SUM(LINE_UNITS) |
| FROM | LINE |
| GROUP BY | P_CODE |
| HAVING | SUM(LINE_UNITS) > (SELECT MAX(LINE_UNITS) FROM LINE); |
Write the command to create statistics for this table.
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WEEK SQL ASSIGNMENT
Complete the following exercise:
Alter your student table adding a new column called enroll_date using the datetime data type.
Populate the new column (enroll_date) with the current date and time.
Using your student table return the student first and last names concatenated with a space and then the enroll_date minus one month. Here is an example of the output:
Name
Date
Jane Smith
2019-05-03 13:14:12
Tom Jones
2020-08-07 05:23:56
Using your student table return the month name for the enroll_date column. For example, if the enroll_date was 11-6-2019 then the month name would be June.
select * from cast where cast_id=162652763; Use explain to display the query plan without creating any index. Now create an index to speed up the query. Use explain and timer to show the improvement.
(A) Write a query which shows the employee IDs that are unique to the employee table. Order the employee IDs in descending order. An employee ID Is the same in both tables if the integer value of the ID matches.
(B) We want to add a new column to the employee table. We want to provide a new column with a more complete phone number. Right now the PHONENO column only shows the last 4 digits. We want a new column which is called PHONE and consists of ###-###-####. The last 4-digits are already in the PHONENO column. The first three digits should be 416 and the next three should be 123. To improve clarity in the table, we also want to rename the PHONENO column to PHONEEXT. Show all the commands used to accomplish this, then, select all data for employees who have the last name of 'smith' (case insensitive).
(C) Show a list of employee id, names, department, years and job of any employee in the staff table who makes a total amount more than their manager or has more years of service than…
Chapter 11 Solutions
Database Systems: Design, Implementation, & Management
Ch. 11 - Prob. 1RQCh. 11 - What index should you create? Write the required...Ch. 11 - What is the focus of most performance-tuning...Ch. 11 - What are database statistics, and why are they...Ch. 11 - How are database statistics obtained?Ch. 11 - What database statistics measurements are typical...Ch. 11 - How is the processing of SQL DDL statements (such...Ch. 11 - In simple terms, the DBMS processes a query in...Ch. 11 - If indexes are so important, why not index every...Ch. 11 - What is the difference between a rule-based...
Ch. 11 - Prob. 11RQCh. 11 - What are some general guidelines for creating and...Ch. 11 - Prob. 13RQCh. 11 - Prob. 14RQCh. 11 - Prob. 15RQCh. 11 - SELECT SELECT EMP_LNAME, EMP_FNAME, EMP_AREACODE,...Ch. 11 - Problem 1 and 2 are based on the following query:...Ch. 11 - Using Table 11.4 as an example, create two...Ch. 11 - Problems 46 are based on the following query:...Ch. 11 - Problems 46 are based on the following query:...Ch. 11 - Prob. 6PCh. 11 - Problems 732 are based on the ER model shown in...Ch. 11 - Problems 732 are based on the ER model shown in...Ch. 11 - Problems 732 are based on the ER model shown in...Ch. 11 - Problems 732 are based on the ER model shown in...Ch. 11 - Problems 1114 are based on the following query:...Ch. 11 - Problems 1114 are based on the following query:...Ch. 11 - Problems 1114 are based on the following query:...Ch. 11 - Problems 1114 are based on the following query:...Ch. 11 - Problems 15 and 16 are based on the following...Ch. 11 - Problems 15 and 16 are based on the following...Ch. 11 - Problems 1721 are based on the following query:...Ch. 11 - Problems 1721 are based on the following query:...Ch. 11 - Prob. 19PCh. 11 - Prob. 20PCh. 11 - Problems 1721 are based on the following query:...Ch. 11 - SELECT SELECT P_CODE, P_DESCRIPT, P_PRICE,...Ch. 11 - Problems 2224 are based on the following query:...Ch. 11 - Problems 2224 are based on the following query:...Ch. 11 - Problems 25 and 26 are based on the following...Ch. 11 - Problems 25 and 26 are based on the following...Ch. 11 - Prob. 27PCh. 11 - Problems 27 and 28 are based on the following...Ch. 11 - Problems 2932 are based on the following query:...Ch. 11 - Problems 2932 are based on the following query:...Ch. 11 - Problems 2932 are based on the following query:...Ch. 11 - Problems 2932 are based on the following query:...
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