单选题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 DEPARTMENT_ID = NULL; What is true about this SQL statement ?（）AThe SQL statement displays the desired results.BThe column in the WHERE clause should be changed to display the desired results.CThe operator in the WHERE clause should be changed to display the desired results.DThe WHERE clause should be changed to use an outer join to display the desired results.
单选题
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 DEPARTMENT_ID = NULL; What is true about this SQL statement ?（）
A
The SQL statement displays the desired results.
B
The column in the WHERE clause should be changed to display the desired results.
C
The operator in the WHERE clause should be changed to display the desired results.
D
The WHERE clause should be changed to use an outer join to display the desired results.
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