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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

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Similar questions

Mark the Category field in the BOOK_PRICING table as not being used. Check to see if the field can still be used.
From 16 to 19
Which function does the PRIMARY KEY clause perform in table creation? It ensures that’s non-NULL values can act as unique keys. It ensures that non-NULL values can as candidate keys. It ensures that each value in row is unique. It ensures that each value in the column is unique
Use the data from the class assignment, ALTER TABLE and add two more columns Phone and email. Describe the table (show its structure) and drop the country column, describe the table (show structure). Now, create a new table based on the existing table person with the help of a subquery (The new table will contain the data from “person” table) and name the table person_self. Show its output (table created and its structure). NOTE: Use the ALTER TABLE command with ADD clause Use the ALTER TABLE command with DROPCOLUMN clause Use the CREATE TABLE command with AS (SELECT SUBQUERY) clause
The InstantRide User Satisfaction team requires the average and maximum number of rides users have taken so far with InstantRide. In addition, they would like to know the total number of travels. However, they need these details with the corresponding column names Average, Maximum and Total by using the AVG, MAX and SUM functions. In order to accomplish this, you will first need to create a derived table from the TRAVELS table to pass the TRAVEL_ID count to the three mathematical functions.
Which clause is used to change a column in a table? a. SET b. MODIFY c. ALTER d. UPDATE
Create lookup functions to complete the summary section. In cell I6, create a formula using the VLOOKUP function to display the number of hours worked in the selected week. Look up the week number in cell I5 in the range A17:G20, and return the value in the 2nd column. Use absolute references for cell I5 and the range A17:G20.
Insert at least three rows into your EMPLOYEE_xx table. Use the next value of the sequence you created , EMPL_SEQUENCE_xx as the value for the employee ID for every row inserted. You may choose values for the other columns Test your constraint on the rate column by trying to update a row in the EMPLOYEE_xx table with the value of 6 used for the Pay Rate (you choose the row). Drop your EMPLOYEE_xx table and make sure it HAS been purged from the recyclebin
CREATE TABLE consumer ( ConsumerID INT PRIMARY KEY, FirstName VARCHAR(50), LastName VARCHAR(50), Age INT, Gender VARCHAR(10), OnlineInStore VARCHAR(20)); INSERT INTO consumer (ConsumerID, FirstName, LastName, Age, Gender, OnlineInStore) VALUES (1, 'John', 'Doe', 25, 'Male', 'Online');INSERT INTO consumer (ConsumerID, FirstName, LastName, Age, Gender, OnlineInStore) VALUES (2, 'Jane', 'Smith', 30, 'Female', 'In-store');INSERT INTO consumer (ConsumerID, FirstName, LastName, Age, Gender, OnlineInStore) VALUES (3, 'Mike', 'Johnson', 20, 'Male', 'Online');INSERT INTO consumer (ConsumerID, FirstName, LastName, Age, Gender, OnlineInStore) VALUES (4, 'Sarah', 'Williams', 35, 'Female', 'In-store');INSERT INTO consumer (ConsumerID, FirstName, LastName, Age, Gender, OnlineInStore) VALUES (5, 'Chris', 'Davis', 28, 'Male', 'Online'); CREATE TABLE InStoreRetailer ( RetailerID INT PRIMARY KEY, RetailerName VARCHAR(50), StoreLayout VARCHAR(50), CustomerService…
Using a CREATE statement to create a table called s1, which is a duplicate of table STUDENT, then remove all the data from s1 (you need to write two statements for this question.)
To paste information from one table into another, what command should be used?