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
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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
Please fill in the blanks according to hints given in brackets.In the country of Colombia, burning “Mr. Old Year” is a New Year’s (1.习俗). It requires the (2.全家参与). It is a lot of fun; they create a big stuffed male doll that (3.代表旧年). Then they (4.塞入)the doll with a large choice of different materials. Sometimes they put some little (5.烟火)in it to make it more exciting at the time they burn it.