MySQL join together 2 columns without duplicates


MySQL join together 2 columns without duplicates



I have a tablethat looks like following:


username is_superuser last_login name roles roles_for_groups
rob 0 21-06-18 CCTSAT dev full_access
rob 0 21-06-18 CCTSAT ReadOnly ReadOnly
rob 0 21-06-18 CCTSAT ReadOnly full_access
rob 0 21-06-18 CCTSAT ReadOnly_Setup SampleReadOnly
rob 0 21-06-18 CCTSAT ReadOnly_Setup full_access
rob 0 21-06-18 CCTSAT full_access SampleReadOnly
rob 0 21-06-18 CCTSAT full_accessCC full_accessCC
rob 0 21-06-18 CCTSAT full_accessGLE SampleReadOnly
rob 0 21-06-18 CCTSAT full_accessGLE full_accessCC
rob 0 21-06-18 CCTSAT prod_full_access SampleReadOnly
rob 0 21-06-18 CCTSAT prod_full_access full_accessCC



and I would like to merge together the columns roles and roles for groups in a way that if in the column roles for group there is a role that is not present in roles it will be added.



How can I achieve this?





Can you add a result sample to clarify your question?
– Norbert van Nobelen
42 mins ago




1 Answer
1



Use a UNION query to get them both in the same column. By default, UNION removes duplicates from the result.


UNION


UNION


SELECT username, is_superuser, last_login, name, roles
FROM yourTable
UNION
SELECT username, is_superuser, last_login, name, roles_for_groups
FROM yourTable






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