As soon as we ______ your order, we will process it and deliverour package immediately.
A. receive
B. had received
C. received
D. will receive
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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
类别名称，以下语句正确的是（）。（选择一项）
A. selectavg(price),typefrombookgroupbytype
B. selectcount(price),typefrombookgroupbyprice
C. selectavg(price),typefrombookgroupbyprice
D. selectcount(price),typefrombookgroupbytype
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