Oracle 12c: SQL
3rd Edition
ISBN: 9781305251038
Author: Joan Casteel
Publisher: Cengage Learning
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Chapter 4, Problem 2HOA
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Changing the SQL command
- In a Relational
Database , the Primary Key uniquely identifies a row in the table. - The Primary Key must be unique and can't be NULL.
- There should be only one Primary Key in a table...
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Chapter 4 Solutions
Oracle 12c: SQL
Ch. 4 - What is the difference between a PRIMARY KEY...Ch. 4 - How can you verify the constraints that exist for...Ch. 4 - A table can have a maximum of how many PRIMARY KEY...Ch. 4 - Which type of constraint can be used to make...Ch. 4 - Which type of constraint should you use to ensure...Ch. 4 - How is adding a NOT NULL constraint to an existing...Ch. 4 - When must you define constraints at the table...Ch. 4 - Prob. 8RQCh. 4 - What is the difference between disabling a...Ch. 4 - Prob. 10RQ
Ch. 4 - Prob. 1MCCh. 4 - Which of the following is not a valid constraint...Ch. 4 - Which of the following SQL statements is invalid...Ch. 4 - What is the maximum number of PRIMARY KEY...Ch. 4 - Prob. 5MCCh. 4 - How many NOT NULL constraints can be created at...Ch. 4 - The FOREIGN KEY constraint should be added to...Ch. 4 - What is the maximum number of columns you can...Ch. 4 - Which of the following commands can you use to...Ch. 4 - Prob. 10MCCh. 4 - In the initial creation of a table, if a UNIQUE...Ch. 4 - Which type of constraint should you use on a...Ch. 4 - Which of the following commands can be used to...Ch. 4 - Which of the following keywords allows the user to...Ch. 4 - Which of the following data dictionary objects...Ch. 4 - Which of the following types of constraints cant...Ch. 4 - Suppose you created a PRIMARY KEY constraint at...Ch. 4 - You’re creating a new table consisting of three...Ch. 4 - Which of the following types of restrictions can...Ch. 4 - Which of the following is the valid syntax for...Ch. 4 - Prob. 1HOACh. 4 - Prob. 2HOACh. 4 - Prob. 3HOACh. 4 - Add a column named Base_salary with a datatype of...Ch. 4 - Create a table named BOOK_STORES to include the...Ch. 4 - Add a constraint to make sure the Rep_ID value...Ch. 4 - Change the constraint created in Assignment #6 so...Ch. 4 - Create a table named REP_CONTRACTS containing the...Ch. 4 - Produce a list of information about all existing...Ch. 4 - Issue the commands to disable and then enable the...
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- Add a new row in the ORDERS table with the following data: Order# = 1023 and Customer# = 1009. Describe the error raised and what caused the error.arrow_forwardAdd a new row in the ORDERS table with the following data: Order# = 1022, Customer# = 2000, and Order date = August 6, 2009. Describe the error raised and what caused the error.arrow_forwardInsert values in Nurse table you created in Q2 Nurse_id: Your roll no NurseName: Your Name Date of Birth: Nullarrow_forward
- An "Orders" table has 30 columns, and the report only needs the order total by date. Which transformation should you perform?arrow_forwardWEEK 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.arrow_forwardPlease elp with the follwoing If you omitted the WHERE clause of an UPDATE or DELETE statements, the query returns an error because the where clause is required. True or Flasearrow_forward
- The following table has been created: CREATE TABLE student table ( stud id NUMBER (6), last_name VARCHAR2 (20), first name VARCHAR2 (20), lunch num NUMBER (4) ) ; Which one of the following INSERT statements will fail? O INSERT INTO student table VALUES (143354, 'Roberts', 'Cameron', 6543); O INSERT INTO student_table (stud_id, last_name, lunch_num) VALUES (143354, Roberts, 6543, 'Cameron'); O INSERT INTO student_table (stud_id, last_name, first_name, lunch_num) VALUES (143354, 'Roberts', 'Cameron', 6543); O INSERT INTO student_table (stud_id, lunch_num, first_name, last_name) VALUES (143352, 6543, 'Cameron', 'Roberts');arrow_forwardWrite a SELECT statement that returns three columns: EmailAddress, OrderID, and the order total for each customer. To do this, you can group the result set by the EmailAddress and OrderID columns. In addition, you must calculate the order total from the columns in the OrderItems table. Write a second SELECT statement that uses the first SELECT statement in its FROM clause. The main query should return two columns: the customer�s email address and the largest order for that customer. To do this, you can group the result set by the EmailAddress column.arrow_forwardNote:- Do correct answer get upvote Else downvotedarrow_forward
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