增删改oracle的列

增加一列：===>    alter table emp add school varchar2(100);

修改一列：===>    alter table emp modify school varchar2(200);

删除一列：===>   alter table emp4 drop column school;

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增加多列：===>    alter table emp add (school1 varchar2(10),school2 number);

修改多列：===>    alter table emp modify (school1 varchar2(20),school2 varchar2(20));

删除多列：===>    alter table emp drop (school1,school2);

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alter table BOM_RT_LATEST_XX add (
column072 varchar2(150),column073 varchar2(150),column074 varchar2(150),column075 varchar2(150),
column076 varchar2(150),column077 varchar2(150),column078 varchar2(150),column079 varchar2(150),column080 varchar2(150),
column081 varchar2(150),column082 varchar2(150),column083 varchar2(150),column084 varchar2(150),column085 varchar2(150),
column086 varchar2(150),column087 varchar2(150),column088 varchar2(150),column089 varchar2(150),column090 varchar2(150),
column091 varchar2(150),column092 varchar2(150),column093 varchar2(150),column094 varchar2(150),column095 varchar2(150),
column096 varchar2(150),column097 varchar2(150),column098 varchar2(150),column099 varchar2(150),column100 varchar2(150),
column101 varchar2(150),column102 varchar2(150),column103 varchar2(150),column104 varchar2(150),column105 varchar2(150),
column106 varchar2(150),column107 varchar2(150),column108 varchar2(150))