doc - How to change duplicate rows to unique values in mysql databse -

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i have database table 1m records. need find duplicate names in table , make them unique.

id name

1 2 3 b 4 c 5 c should changed to...

id name

1 2 a-1 3 b 4 c 5 c-1 there effective way of doing mysql query or procedure?

thanks in advance!

i needed similar table working on. needed unique url field previous keepers of data did not keep these constraints. key create temp table.

i used response here help: mysql error 1093 - can't specify target table update in clause

take note doesn't perform well, again if need run once on database clean table shouldn't bad.

update `new_article` `upd` set `upd`.`url` = concat(`upd`.`url`, '-', `upd`.`id`) `upd`.`url` in(     select `url` (         select `sel`.`url` `new_article` `sel`         group `sel`.`url` having count(`sel`.`id`) > 1     ) `temp_table` );

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