What does the TRUNCATE statement do?()
A、Removes the table
B、Removes all rows from a table
C、Shortens the table to 10 rows
D、Removes all columns from a table
E、Removes foreign keys from a table
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The EMP table contains these columns: LAST NAME VARCHAR2(25) SALARY NUMBER(6,2) DEPARTMENT_ID NUMBER(6) You need to display the employees who have not been assigned to any department. You write the SELECT statement: SELECT LAST_NAME, SALARY, DEPARTMENT_ID FROM EMP WHERE DEPARMENT_ID = NULL; What is true about this SQL statement? ()
A、The SQL statement displays the desired results.
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