q6 To change a primary key in table you should do the followings:use the ALTER TABLE to drop the current key, then add the new key using ALTER TABLE.ause the ALTER KEY to drop the current key, then add the new key using ALTER KEY.b OPrimary Key cannot be changed after creating the table, You have to drop the table and recreate.c Oit again.use the ALTER TABLE to drop the current key, then add the new key using CREATE TABLE.d O

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To change a primary key in table you should do the followings: use the ALTER TABLE to drop the current key, then add the new key using ALTER TABLE use the ALTER KEY to drop the current key, then add the new key using ALTER KEY Primary Key cannot be changed after creating the table, You have to drop the table and recreate it again. use the ALTER TABLE to drop the current key, then add the new key using CREATE TABLE

To change a primary key in table you should do the followings: use the ALTER TABLE to drop the current key, then add the new key using ALTER TABLE use the ALTER KEY to drop the current key, then add the new key using ALTER KEY Primary Key cannot be changed after creating the table, You have to drop the table and recreate it again. use the ALTER TABLE to drop the current key, then add the new key using CREATE TABLE

Oracle 12c: SQL

3rd Edition

ISBN:9781305251038

Author:Joan Casteel

Publisher:Joan Casteel

Chapter3: Table Creation And Management

Section: Chapter Questions

Problem 2MC

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Similar questions

Add a constraint to make sure the Rep_ID value entered in the BOOK_STORES table is a valid value contained in the STORE_REPS table. The Rep_ID columns of both tables were initially created as different datatypes. Does this cause an error when adding the constraint? Make table modifications as needed so that you can add the required constraint.
Suppose you created a PRIMARY KEY constraint at the same time you created a table and later decide to name the constraint. Which of the following commands can you use to change the constraint’s name? ALTER TABLE … MODIFY ALTER TABLE … ADD ALTER TABLE … DISABLE None of the above commands can be used.
In the initial creation of a table, if a UNIQUE constraint is included for a composite column that requires the combination of entries in the specified columns to be unique, which of the following statements is correct? a. The constraint can be created only with the ALTER TABLE command. b. The constraint can be created only with the table-level approach. c. The constraint can be created only with the column-level approach. d. The constraint can be created only with the ALTER TABLE MODIFY command.
Which of the following is a correct statement? You can restore the data deleted with the DROP COLUMN clause, but not the data deleted with the SET UNUSED clause. You can’t create empty tables—all tables must contain at least three rows of data. A table can contain a maximum of 1000 columns. The maximum length of a table name is 265 characters.
A new table has been requested to support tracking automated emails sent to customers. Create the table and add data as described below. Tablename: email_log Columns: emailid (numeric), emaildate (datetime), customer# (numeric) Primary key: emailid column, define as an Identity Column Add the following data rows and display resulting rows (if any errors occur, explain why the error is expected) Emaildate = current date, customer# = 1007 Emailid = specify to use the column default value, emaildate = current date, customer# = 1008 Emailid = 25, emaildate = current date, customer# = 1009
Which of the following is true? a. If you truncate a table, you cant 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 cant 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, its always added as the last column of the table.
Which of the following statements is correct? A table can contain a maximum of only one column marked as unused. You can delete a table by removing all columns in the table. Using the SET UNUSED clause allows you to free up storage space used by a column. None of the above statements are correct.
Which of the following commands removes all data from a table but leaves the tables structure intact? a. ALTER TABLE secustomerorders DROP UNUSED COLUMNS; b. TRUNCATE TABLE secustomerorders; c. DELETE TABLE secustomerorders; d. DROP TABLE secustomerorders;
Which of the following commands can be used to enable a disabled constraint? a. ALTER TABLE MODIFY b. ALTER TABLE ADD c. ALTER TABLE DISABLE d. ALTER TABLE ENABLE
Which of the following keywords allows the user to delete a record from a table, even if rows in another table reference the record through a FOREIGN KEY constraint? a. CASCADE b. CASCADE ON DELETE c. DELETE ON CASCADE d. DROP e. ON DELETE CASCADE
Which of the following characters can be used in a table name? a. b. ( c. % d. !
What is the maximum number of PRIMARY KEY constraints allowed for a table? a. 1 b. 2 c. 30 d. 255

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