To restore the values of a table, you must use the. .command. Select one: a.COMMIT b.ROLLBACK c.REVOKE d.RESTORE
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- 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 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 CASCADEWhich command should you use to copy data from one table and have it added to an existing table?
- 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 command is used to create a table based on data already contained in an existing 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 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 represents a field in a table? a record a row a column an entitywhich DML keyword is used to make change to existing records in a table? a) Insert b) Select c) Update d) Delete
- Which SQL statement key word can be used to delete a record within a table?a. DELETEb. DROPc. REMOVEd. CLEARWhich 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.134. EMPDET is an external table containing the columns EMPNO and ENAME. Which command would work in relation to the EMPDET table? a. UPDATE empdetSET ename = 'Amit'WHERE empno = 1234; b. DELETE FROM empdetWHERE ename LIKE 'J%'; c. CREATE VIEW empvuASSELECT * FROM empdept; d. CREATE INDEXempdet_idxON empdet(empno);
