Tek-Tips is the largest IT community on the Internet today!

Members share and learn making Tek-Tips Forums the best source of peer-reviewed technical information on the Internet!

Register Log in
  • Congratulations SkipVought on being selected by the Tek-Tips community for having the most helpful posts in the forums last week. Way to Go!

How can I find the duplicate rows in mysql and also make it unique.

Status
Not open for further replies.
toomee

toomee

Technical User
Jan 28, 2003
10
0
0
TH
How can I find the duplicate rows in mysql and also make it unique.

Thanks a lot

 
Sort by date Sort by votes
Code: 
select c1,c2 
  from t
 group by c1,c2
 having count(*) > 1

SQL has two mechanisms for avoiding duplicity, primary keys and unique constraints. Do a search in the docs at for more information.
 
Upvote 0 Downvote
Status
Not open for further replies.

Similar threads

lupidol
  • Locked
  • Question
mysql cannot add rows with "UNION" 1
Replies
5
Views
113
Chris Miller
Chris Miller
lupidol
  • Locked
  • Question
Cannot create new table in mySQL 3
Replies
6
Views
134
lupidol
lupidol
EdLentz
  • Locked
  • Question
How do I use a keyword in a query??
Replies
6
Views
138
EdLentz
EdLentz
EdLentz
  • Locked
  • Question
Need to compare two tables and list the differences
Replies
3
Views
103
EdLentz
EdLentz
dylim
  • Locked
  • Question
SQL_CALC_FOUND_ROWS still runs in MySQL 8.0.29
Replies
2
Views
125
dylim
dylim

Part and Inventory Search

Sponsor

Back
Top