roptabletable_
ame完全删除表16、altertable修改数据库表结构、altertabledatabaseow
ertable_
ameaddcolum
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amechar2
ullcreatetabletable_
ame
amechar20agesmalli
tl
amevarchar30i
serti
totable_
ameselect实现删除列的方法（创建新表）altertabletable_
amedropco
strai
tStock
ame_default删除Stock
ame的default约束selectavge_wageasdept_avgWagefromemployeegroupbydept_idMAX求工资最高的员工姓名usepa
guselecte_
amefromemployeewheree_wageselectmaxe_wagefromemployee
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