Virtual column do not recognize SPLIT function and returns balnks.
When I "Test" the formula for this virtual column, the expresión result is correct even results are correct in a file generated by a bot. But in the app and in preview data virtual column is empty.
Solved! Go to Solution.
SPLIT requires a text string to operate on. The SELECT returns a LIST.
Since it appears you are dealing with a List of Lists, try using this expression instead:
UNIQUE(SPLIT(CONCATENATE(SELECT(PRYECTOS[List de BD]...))))
The CONCATENATE flattens the list returned from the SELECT into a single text string. The SPLIT then re-creates a LIST from that string expression. And of course UNIQUE will eliminate duplicates.
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