php - Add Number for duplicate entry in sql -

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i have table :-

id               name                 email                     username 1               johen mak         jojo@yahoo.com              johen_mak 2               johen mak         jojo@gmail.com              jojo 3               gawil gorgy       jojo@homail.com             gawil_gorgy 4               johen mak         jojo@yamail.com             jojo 5               johen mikik       jojo@yamail.com             jojo

in table in database entry in same username, need add _1 .... end username

i need update above table this:-

id               name                 email                     username 1               johen mak         jojo@yahoo.com              johen_mak 2               johen mak         jojo@gmail.com              jojo 3               gawil gorgy       jojo@homail.com             gawil_gorgy 4               johen mak         jojo@yamail.com             jojo_1 5               johen mikik       jojo@yamail.com             jojo_2

how can that

i know solution don't answer problem have perhaps you:

update     tablename t  join tablename t2     on t1.id<t2.id , t1.name = t2.name set t2.name=concat(t2.name,'_',t2.id)

this add _id duplicates names after first one


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