我得很好用啊create table tbl1
(idx int primary key);select * from tbl1;alter table tbl1
add data varchar(10);select * from tbl1;alter table tbl1
add column data2 varchar(10);select * from tbl1;drop table tbl1;
(idx int primary key);select * from tbl1;alter table tbl1
add data varchar(10);select * from tbl1;alter table tbl1
add column data2 varchar(10);select * from tbl1;drop table tbl1;
中间的空格应该是半角的