php - How could I filter duplicates? -

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information:

table = giveaway

form 1 = id

form 2 = username

form 3 = userid

form 4 = wish

end of information

i trying make filter through duplicate usernames , userids

note: people enter userid , username (it giveaway)

can post me code that?

try one:

select  `username`,`userid` `giveaway` group `username` having count(`username`) > 1 union select `username`,`userid` `giveaway` group `userid` having count(`userid`) > 1

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