sql query with 3 tables with multiple values column

I have 3 tables:

participants (id, name)
groups (id, name)
participant_groups (participant_id, group_id)

I need to show a table with all the participants and a last column with the participant’s groups, which can be several.

I have the following select that returns all the participants but if it has more than one group I have several records of the same participant.

SELECT *
    FROM participants
      CROSS JOIN groups
      INNER JOIN participant_groups
        ON groups.id = participant_groups.id
        AND participants.id = participant_groups.id
    ORDER BY participants.name, participants.id

Thanks

Answers:

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Method 1

Just add a GROUP BY and GROUP_CONCAT:

SELECT participants.id, participants.name, GROUP_CONCAT(groups.name) AS group_list
FROM participants
LEFT JOIN participant_groups ON participants.id = participant_groups.participant_id
INNER JOIN groups ON participant_groups.group_id = groups.id
GROUP BY participants.id


All methods was sourced from stackoverflow.com or stackexchange.com, is licensed under cc by-sa 2.5, cc by-sa 3.0 and cc by-sa 4.0

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