我有一个包含数据的表格,如下所示:
I have a table with data which looks something like the following:
# the columns #
url
title
group
id_within_group
http://www.google.com
google
search engine
1
http://www.yahoo.com
yahoo
search engine
2
http://www.bing.com
bing
search engine
3
http://www.facebook.com
facebook
social media
1
http://www.twitter.com
twitter
social media
2
如果我这样做
select * from table1 where group = "search engine"
我会得到
http://www.google.com
google
search engine
1
http://www.yahoo.com
yahoo
search engine
2
http://www.bing.com
bing
search engine
3
我希望能够删除这些行中的任何一行,但以某种方式让它重新编号 id_within_group.
I would like to be able to delete any of these rows, but somehow get it to renumber the id_within_group.
所以,如果我从上面的 3 个中删除第二个,它应该自动重新编号然后留给我
SO if I delete the second one from the 3 above, it should automatically renumber then leaving me with
http://www.google.com
google
search engine
1
http://www.bing.com
bing
search engine
2
这可能吗?
如果您只需要显示连续整数,我的建议是在 SELECT
中执行此操作.
My suggestion would be to do this in the SELECT
if you just need to display a sequential integer.
SELECT url ,
title ,
[group] ,
id_within_group ,
ROW_NUMBER() over (partition BY [group] ORDER BY id_within_group) AS sequential_index
FROM YourTable
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