John Black, a new client, who has been a chargeable person for a number of years, has asked you to explain the following, with reference to income tax.

(c) The implications of late payment of income tax. (3 marks)

查询订购单号首字符是“P”的订单信息，应该使用命令( )。

A) SELECT * FROM 订单 WHERE HEAD (订购单号，1)=“P”
B) SELECT * FROM 订单 WHERE LEFT (订购单号，1)=“P”
C) SELECT * FROM 订单 WHERE “P” $订购单号
D) SELECT * FROM 订单 WHERE RIGHT(订购单号，1)=“P”