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.
Which of the following is not a correct statement?a. A table can be modified only if it doesn’t contain any rows of data.b. The maximum number of characters in a table name is 30.c. You can add more than one column at a time to a table.d. You can’t recover data contained in a table that has been truncated.
If a particular column is not allowed to be null, what is the result if the column is left empty?
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
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- Q-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_forwardWhich clause is used to change a column in a table? a. SET b. MODIFY c. ALTER d. UPDATEarrow_forwardThe 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_forward
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