单选题Examine the structure of the EMPLOYEES table: EMPLOYEE_ID NUMBER Primary Key FIRST_NAME VARCHAR2(25) LAST_NAME VARCHAR2(25) HIRE_DATE DATE Which UPDATE statement is valid?（）AUPDATE employees SET first_name = 'John' SET last_name ='Smith' WHERE employee_id = 180;BUPDATE employees SET first_name = 'John', SET last_name ='Smith' WHERE employee_id = 180;CUPDATE employees SET first_name = 'John' AND last_name ='Smith' WHERE employee_id = 180;DUPDATE employees SET first_name = 'John', last_name ='Smith' WHERE employee_id = 180;
单选题
Examine the structure of the EMPLOYEES table: EMPLOYEE_ID NUMBER Primary Key FIRST_NAME VARCHAR2(25) LAST_NAME VARCHAR2(25) HIRE_DATE DATE Which UPDATE statement is valid?（）
A
UPDATE employees SET first_name = 'John' SET last_name ='Smith' WHERE employee_id = 180;
B
UPDATE employees SET first_name = 'John', SET last_name ='Smith' WHERE employee_id = 180;
C
UPDATE employees SET first_name = 'John' AND last_name ='Smith' WHERE employee_id = 180;
D
UPDATE employees SET first_name = 'John', last_name ='Smith' WHERE employee_id = 180;
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