Which of the following is the valid syntax for creating a VIEW to view a subset of a table? CREATE VIEW USA_customers AS SELECT * FROM customer WHERE country = 'USA'; CREATE VIEW USA_customers SELECT * FROM customer WHERE country = 'USA'; CREATE VIEW USA_customers AS customer WHERE country = 'USA'; CREATE VIEW USA_customers AS customer SELECT * WHERE country = 'USA';

Which of the following is the valid syntax for creating a VIEW to view a subset of a table? CREATE VIEW USA_customers AS SELECT * FROM customer WHERE country = 'USA'; CREATE VIEW USA_customers SELECT * FROM customer WHERE country = 'USA'; CREATE VIEW USA_customers AS customer WHERE country = 'USA'; CREATE VIEW USA_customers AS customer SELECT * WHERE country = 'USA';

Oracle 12c: SQL

3rd Edition

ISBN:9781305251038

Author:Joan Casteel

Publisher:Joan Casteel

Chapter3: Table Creation And Management

Section: Chapter Questions

Problem 15MC

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Similar questions

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.
Which of the following is not a valid statement? You can change the name of a table only if it doesn’t contain any data. You can change the length of a column that doesn’t contain any data. You can delete a column that doesn’t contain any data. You can add a column to a table.
Which of the following is the valid syntax for adding a PRIMARY KEY constraint to an existing table? ALTER TABLE tablename ADD CONSTRAINT PRIMARY KEY (columnname); ALTER TABLE tablename ADD CONSTRAINT (columnname) PRIMARY KEY constraintname; ALTER TABLE tablename ADD [CONSTRAINT constraintname] PRIMARY KEY; None of the above is valid syntax.
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 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.
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.
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
When must a comma be used in the SELECT clause of a query? a. when a field name is followed by a column alias b. to separate the SELECT clause and the FROM clause when only one field is selected c. Its never used in the SELECT clause. d. when listing more than one field name and the fields arent concatenated e. when an arithmetic expression is included in the SELECT clause
Which of the following commands creates a new table containing two columns? CREATE TABLE newname (coll DATE, col2 VARCHAR2); CREATE TABLE newname AS (SELECT title, retail, cost FROM books); CREATE TABLE newname (col1, co12); CREATE TABLE newname (col1 DATE DEFAULT SYSDATE, co12 VARCHAR2 (1));
Which of the following commands drops any columns marked as unused from the SECUSTOMERORDERS table? DROP COLUMN FROM secustomerorders WHERE column_status = UNUSED ALTER TABLE secustomerorders DROP UNUSED COLUMNS; ALTER TABLE secustomerorders DROP (unused); DROP UNUSED COLUMNS;
Which of the following is a valid table name? a. 9NEWTABLE b. DATE9 c. NEWTABLE d. None of the above are valid table names.
Which command is used to create a table based on data already contained in an existing table?