表格的创建与修改

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##创建
createtabletmpas
select*fromtmp

##添加列
altertabletmp
add(tmp1date,tmp2int);

##修改列
altertabletmp
modifytmp1int

##删除列
altertabletmp
dropcolumntmp2

##修改表名
renametabletmptotemp
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