Now the pollution caused by the increasing number of car_____ more and more serious in many cities.
A. become
B. is becoming
C. became
D. had become
查看答案
As soon as we ______ your order, we will process it and deliverour package immediately.
A. receive
B. had received
C. received
D. will receive
现有书目表book，包含字段：价格price(float)，类别type(char);现在查询各个
A. 的平均价格、类别名称，以下语句正确的是（）。
B. selectavg(price),typefrombookgroupbytype
C. selectcount(price),typefrombookgroupbyprice
D. selectavg(price),typefrombookgroupbyprice
E. selectcount(price),typefrombookgroupbytype
现有订单表orders，包含用户信息userid,产品信息productid,以下（）语句能够返回至少被订购过两回的productid?（选择一项）
A. selectproductidfromorderswherecount(productid)>1
B. selectproductidfromorderswheremax(productid)>1
C. selectproductidfromorderswherehavingcount(productid)>1groupbyproductid_
D. selectproductidfromordersgroupbyproductidhavingcount(productid)>1
查询student表中的所有非空email信息,以下语句正确的是（）。（选择一项）
A. Selectemailfromstudentwhereemail!=null
B. Selectemailfromstudentwhereemailnotisnull
C. Selectemailfromstudentwhereemail<>null
D. Selectemailfromstudentwhereemailisnotnull
微信支付 
支付宝支付