mysql - Find duplicates in database based on two records -
i have database fields following:
id -- user id -- role id 1 --- 100 ----- 119 2 --- 100 ----- 119 3 --- 101 ----- 101 4 --- 102 ----- 250 5 --- 103 ----- 300
i'd able feed in list of user ids, , have return role id's duplicated. example, sample above, print out following:
100 --- 119 --- 2
i'd query able delete these duplicates well, after run select see results
select user_id, role_id, count() user_roles user_id in () group user_id, role_id having count() > 1;
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