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    Working idea ? yes. Standard ? No, standard are using another table with foreign key and unique constraint (for set only not list), Good ? It depends of the requirments. If you really want to know if it's a good idea, we would need more information : volume of data, what kind of request are performed against the set ? Commented Nov 6, 2017 at 12:56
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    You don't have to save the list into a single field. Your example is just a display; you can put the audience in its own table and still have it displayed as a comma delimited list. Commented Nov 6, 2017 at 18:55