Question

SQL怎么把一个表字段信息(ID)修改为对应另一个表的内容

A表 B表

A表、B表都有address_ID这一列，B表中的addressname是address_ID对应的具体内容。请问，如何将A表中的address_ID改为B表中对应的addressname?
1楼、2楼你们的回答确定是sql sever上的语句吗？？





Answer 1

 

 

 

-- 先更改A表中列的数据类型

ALTER TABLE 态旦A ALTER COLUMN address_ID VARCHAR(128)

 

-- 开始联接查询,条帆梁扰件更新

UPDATE a

SET 渣唯 a.address_ID = b.addressname

FROM a, b

WHERE a.address_ID = b.address_ID

SELECT  *  FROM a

 

 

 

Answer 2

呵呵，楼上的update语句里，连B表都拆野没有，不腔行报错就怪了。

update A set A.address_id = (select B.addressname from B where B.address_id = A.address_id)

执行之前，确伍御哗认A表address_id字段的类型和长度。

Answer 3

update a set a.address_id = b.addressname where a.address_id=b.addree_id

执行语句前最好检查a.address_id 的长度和慧伍是否和碧裂b.addressname一致，最好大于等于后者，这样转换后信息不丢失。
另唤或外，要求a.address_id为字符型。

追问

update A set A.address_id = B.addressname where A.address_id=B.address_id

为什么报错啊

能留个联系方式吗 详谈~~

追答

不好意思，没验证。现在把经过验证的给你。在sql2000，2005，2008上通过
UPDATE a
SET address_id = c.addressname
FROM a INNER JOIN
(SELECT address_id, addressname
FROM b) AS c ON a.address_id = c.address_id
绝对不报错。
注意a表address_id 为字符型，且宽度足够

Answer 4

update A表 set A表.address_Id=B表.addressname from B表 where A表伍皮.address_ID=B表腔缺差扮基.address_Id

Answer 5

--查询时翻译字段
select A.address_ID,B.addressname from A,B where A.address_ID = B.address_ID

go

--真正update表A
alter table A alter column address_ID varchar(128)

update A set A.address_id = B.addressname where A.address_id=B.addree_id

追问

update A set A.address_id = B.addressname where A.address_id=B.address_id

为什么报错啊
能留个联系方式吗 ？ 详谈~~

追答

我晕，纯属失误，这句应该没问题了

update a set a.address_ID = b.addressname from a,b where a.address_ID = b.address_ID