如何在MySQL数据库中的单词之前添加URL

Question

我的表是行

ID    Twitter                             Facebook                   UserID
1      @kamel                              http:www.fb.com/rtymal       10
2      http:www.twitter.com/rlyill         makmal                       170
3      ymikll                              mtymal                       15
4      @wiled                              makfrl                       13

我需要为没有它的所有行添加http:www.twitter.com。与facebook相同。

所以在表格中我需要像

这样的结果

ID    Twitter                             Facebook                   UserID
1      http:www.twitter.com/kamel     http:www.fb.com/rtymal           10
2      http:www.twitter.com/rlyill    http:www.fb.com/makmal           170
3      http:www.twitter.com/ymikll    http:www.fb.com/mtymal           15
4      http:www.twitter.com/wiled     http:www.fb.com/makfrl           13 

Answer 1

如果要更新表格内容：

UPDATE tablename SET Twitter = concat('http:www.twitter.com/', Twitter)
WHERE Twitter not like 'http:www.twitter.com%'

如果您只想修改结果集，请在选择中执行类似操作：

select case when Twitter not like 'http:www.twitter.com%' then
                concat('http:www.twitter.com/', Twitter) else  Twitter end
from tablename