第22题: [单项选择]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/ 参考答案:B 答案解析:[解析] 本题考查如何使用SQL结合字符串函数实现条件查询。4个选项中,选项B)中的函数LEFT(订购单号,1)的功能是取出订购单号的首字符,将该查询条件置于SQL的WHERE子句,能够实现题目所要求
A. spend less time traveling B. cut down research costs C. develop their ideas more quickly D. keep up with current developments 参考答案:C 答案解析:事实细节题。根据原文结尾最后一句话,This trend has led to a great deal of academic contact between disciplines, and a