Welcome to OGeek Q&A Community for programmer and developer-Open, Learning and Share
Welcome To Ask or Share your Answers For Others

Categories

0 votes
395 views
in Technique[技术] by (71.8m points)

sql - Finding rows with same values in multiple columns

I am trying to find rows that have duplicate values, but only based off of a select number of columns, not a single column or the entire row. For example, if my table looked like this:

ID     Address    State    Name
-------------------------------
0      7 Brown    NY       John
1      3 Red      WX       Jane
2      7 Brown    WX       Ted
3      7 Brown    NY       Fred

My question would be:

Find all ID's for rows where the row's Address and State field matched another row's Address and State field.

The answer to this query would be:

ID    Address    State    Name
------------------------------
0     7 Brown    NY       John
3     7 Brown    NY       Fred

Any Ideas?

Suggestions: How to select multiple columns values same rows from single table

See Question&Answers more detail:os

与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…
Welcome To Ask or Share your Answers For Others

1 Reply

0 votes
by (71.8m points)

Try the following:

SELECT A.*
FROM YourTable A
INNER JOIN (SELECT Address, State
            FROM YourTable
            GROUP BY Address, State
            HAVING COUNT(*) > 1) B
ON A.Address = B.Address AND A.State = B.State

与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…
OGeek|极客中国-欢迎来到极客的世界,一个免费开放的程序员编程交流平台!开放,进步,分享!让技术改变生活,让极客改变未来! Welcome to OGeek Q&A Community for programmer and developer-Open, Learning and Share
Click Here to Ask a Question

...