本文介紹了重新編號(hào)一組行的處理方法，對(duì)大家解決問(wèn)題具有一定的參考價(jià)值，需要的朋友們下面隨著小編來(lái)一起學(xué)習(xí)吧！
問(wèn)題描述
我有一個(gè)包含數(shù)據(jù)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
如果我這樣做
select * from table1 where group = "search engine"
我會(huì)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
我希望能夠刪除這些行中的任何一行，但以某種方式讓它重新編號(hào) 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，如果我從上面的 3 個(gè)中刪除第二個(gè)，它應(yīng)該自動(dòng)重新編號(hào)然后留給我
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
這可能嗎?
推薦答案
如果您只需要顯示連續(xù)整數(shù)，我的建議是在 SELECT 中執(zhí)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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