Predict one of the following options, which is used to remove all columns from the table currently marked as unused. O a. DELETE UNUSED O b. DROP UNUSED O. UNUSED O d. TRUNCATE UNUSED
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- Which of the following statements deletes all rows in the HOMEWORK10 table? a. DELETE FROM homework10; b. DELETE . FROM homework10; c. DELETE FROM homework10; d. DELETE FROM homework10 WHERE amid = ; e. Both c and d delete all rows in the HOMEWORK10 table.Which of the following is true? All data in a table can be recovered if the table is dropped with the PURGE option. All data in a table can be recovered from the recycle bin if the table is dropped. All data in a table is lost if the table is dropped. All of the above statements are true.Which of the following SQL statements is invalid and returns an error message? ALTER TABLE books ADD CONSTRAINT books_pubid_uk UNIQUE (pubid); ALTER TABLE books ADD CONSTRAINT books_pubid_pk PRIMARY KEY (pubid); ALTER TABLE books ADD CONSTRAINT books_pubid_nn NOT NULL (pubid); ALTER TABLE books ADD CONSTRAINT books_pubid_fk FOREIGN KEY (pubid) REFERENCES publisher (pubid); All of the above statements are invalid.
- 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 is not a valid SQL statement? CREATE TABLE anothernewtable (newtableid VARCHAR2 (2)); CREATE TABLE anothernewtable (date, anotherdate) AS (SELECT orderdate, shipdate FROM orders); CREATE TABLE anothernewtable (firstdate, seconddate) AS (SELECT orderdate, shipdate FROM orders); All of the above are valid statements.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 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.Which of the following is a valid SQL statement?a. ALTER TABLE secustomersspent ADD DATE lastorder;b. ALTER TABLE secustomerorders DROP retail;c. CREATE TABLE newtable AS (SELECT * FROM customers);d. ALTER TABLE drop column *;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.
- Which of the following characters can be used in a table name?a. –b. (c. %d. !Which of the following is true?a. All data in a table can be recovered if the table is dropped with the PURGE option.b. All data in a table can be recovered from the recycle bin if the table is dropped.c. All data in a table is lost if the table is dropped.d. All of the above statements are true.23-Create a SQL statement to display the table structure of the CLIENTS table.
