database - 如何在现有表中插入一列？

Question

我的表名userdetails

我想在列mob之后插入一个新location列。

我尝试使用代码

alter table userdetails 
add mob varchar2(10) after location;

但它显示错误

ORA-01735: 无效的 ALTER TABLE 选项

请帮我。

我正在使用oracle10g。

Answer 1

尝试摆脱“之后”

alter table userdetails add ( mob varchar2(10) )

Answer 2

没有“后定位”。语法无效。

您可能会走以下路线：只需将 mob varchar 添加到 userdetails。它将被添加到表格的末尾。你仍然可以查询它。ALTER TABLE userdetails ADD (mob varchar2(10))

要获得所需的表结构：

// 1) rename the table
rename userdetails to userdetails_old;

// 2) recreate the table with your wanted structure
// Note that the selection order decides about the table structure.
create table userdetails
as
select a as a
     , b as b
     , location as location
     , mob  as mob
     , c as c
from userdetails_old;

// 3) check what you did
desc userdetails;

// 4) before dropping your old table
drop table userdetails_old;