The Joined List computed column joins or concatenates many values into a single text value. For example, it could join a list of names into text like "Alice, Bob, Susan" using the separator ", "
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Here we can see the column gathering all the values in the Name column and joining them into one long string of text.
But often joining the values of a Multiple Relation brings back a simple list of ingredients. With all these values in one cell, we can now display this list simply in a Text Component.
The Joined List column also allows you to choose how you separate these different values. By default, all values are separated by ", " but you can add whatever you want as a separator – including a value from another column.