Oracle 12c: SQL
3rd Edition
ISBN: 9781305251038
Author: Joan Casteel
Publisher: Cengage Learning
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Chapter 3, Problem 5MC
Which of the following is true?
- a. If you truncate a table, you can’t add new data to the table.
- b. If you change the default value of an existing column, all existing rows containing a NULL value in the same column are set to the new DEFAULT value.
- c. If you delete a column from a table, you can’t add a column to the table with the same name as the previously deleted column.
- d. If you add a column to an existing table, it’s always added as the last column of the table.
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Which of the following is true? (refer to the tables in the JustLee Books database)a. If you truncate a table, you can’t add new data to the table.b. If you change the default value of an existing column, all existing rows containing a NULL value in the same column are set to the new DEFAULT value.c. If you delete a column from a table, you can’t add a column to the table with the same name as the previously deleted column.d. If you add a column to an existing table, it’s always added as the last column of the table.
How do you add a column to an existing table in MySQL?
a. MODIFY TABLE table_name ADD COLUMN new_column CHAR(3);
b. MODIFY TABLE table_name ADD new_column CHAR(3);
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d. ALTER TABLE table_name ADD COLUMN new_column CHAR(3);
Which of the following is a correct statement? ( refer to the tables in the JustLee Books database) a. You can restore the data deleted with the DROP COLUMN clause, but not the data deleted with the SET UNUSED clause. b. You can’t create empty tables—all tables must contain at least three rows of data. c. A table can contain a maximum of 1000 columns. d. The maximum length of a table name is 265 characters.
Chapter 3 Solutions
Oracle 12c: SQL
Ch. 3 - Which command is used to create a table based on...Ch. 3 - Prob. 2RQCh. 3 - What guidelines should you follow when naming...Ch. 3 - What is the difference between dropping a column...Ch. 3 - Prob. 5RQCh. 3 - What happens to the existing rows of a table if...Ch. 3 - Explain the difference between truncating a table...Ch. 3 - Prob. 8RQCh. 3 - What happens if you try to decrease the scale or...Ch. 3 - Are a table and the data contained in the table...
Ch. 3 - Which of the following is a correct statement?
You...Ch. 3 - Prob. 2MCCh. 3 - Which of the following is not a correct...Ch. 3 - Which of the following is not a valid SQL...Ch. 3 - Which of the following is true? a. If you truncate...Ch. 3 - Which of the following commands creates a new...Ch. 3 - Which of the following commands drops any columns...Ch. 3 - Which of the following statements is correct?
A...Ch. 3 - Which of the following commands removes all data...Ch. 3 - Which of the following commands changes a table’s...Ch. 3 - Prob. 11MCCh. 3 - Which of the following is not a valid...Ch. 3 - Which of the following characters can be used in a...Ch. 3 - Which of the following is true?
All data in a...Ch. 3 - Prob. 15MCCh. 3 - Which of the following commands creates a new...Ch. 3 - Which of the following is a valid table name? a....Ch. 3 - Prob. 18MCCh. 3 - Which object in the data dictionary enables you to...Ch. 3 - Prob. 20MCCh. 3 - Create a new table containing the category code...Ch. 3 - Create a new table containing these four columns:...Ch. 3 - Add two columns to the EMPLOYEES table. One...Ch. 3 - Modify the Job_class column of the EMPLOYEES table...Ch. 3 - Prob. 5HOACh. 3 - Rename the EMPLOYEES table as JL_EMPS.
Ch. 3 - Create a new table containing these four columns...Ch. 3 - Prob. 8HOACh. 3 - Truncate the BOOK_PRICING table, and then verify...Ch. 3 - Delete the BOOK_PRICING table permanently so that...
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- Explain the difference between truncating a table and deleting a table.arrow_forwardWhat happens to the existing rows of a table if the DEFAULT value of a column is changed?arrow_forwardModify the Job_class column of the EMPLOYEES table so that it allows storing a maximum width of two characters.arrow_forward
- Which of the following is not a correct statement? A table can be modified only if it doesn’t contain any rows of data. The maximum number of characters in a table name is 30. You can add more than one column at a time to a table. You can’t recover data contained in a table that has been truncated.arrow_forwardQ-1: Fill in the three blanks required to create the table only if it doesn't exist already cur.execute(" CREATE TABLE [_]L (name TEXT, retrieved INTEGER, friends INTEGER) 1Twitterarrow_forwardQuestion 8: Which statement is incorrect regarding tables? Answer: A. B. C. D. You can convert a worksheet list into a table. Since table data cannot be modified, the Re-create button stays active so you can easily start over. If the table range Excel proposes isn't correct, just change it before creating the table. Table formatting can be applied and changed after the table has been created.arrow_forward
- The INSERT statement needs to specify column names unless _____. -multiple rows are being inserted into the table with a single statement -only one row is being inserted into the table -the values are inserted in the same order as the table's columns -the values that are being inserted are for columns that are primary keysarrow_forwardGiven an existing table called Country, write a statement to delete a column called Name from the table. ALTER TABLE Country *Your code goes here */arrow_forwardWhich clause is used to change a column in a table? a. SET b. MODIFY c. ALTER d. UPDATEarrow_forward
- To add new data to a table, which of the following commands is used? Select one: a.ALTER TABLE ADD. b.INSERT C.ADD d.CREATEarrow_forward. Which of the following is not a valid statement? (refer to the tables in the JustLee Books database) a. You can change the name of a table only if it doesn’t contain any data.b. You can change the length of a column that doesn’t contain any data.c. You can delete a column that doesn’t contain any data.d. You can add a column to a table.arrow_forwardGiven an existing table called Country, write a statement to delete a column called IndepDate from the table. ALTER TABLE Country *Your code goes here */arrow_forward
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