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I want to be able to select multiple values with the SQL custom field. Is this possible? When I use a query which as multiple results, I can only pick one.
I found this post: Creating custom field type multiselect list - how to save the values? But this is for creating a new custom field, I would like to change the SQL field a bit. I'm using joomla 3.9.1
When creating/editing the field, set Multiple option to Yes. Or edit Fields - SQL plugin to enable multiple option globally for all SQL fields.
