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airtable-count-unique-array-rollup
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| IF((values), | |
| LEN( | |
| IF( | |
| FIND(",", ARRAYJOIN(ARRAYUNIQUE(values), ",")&"") = 1, | |
| SUBSTITUTE(ARRAYJOIN(ARRAYUNIQUE(values), ",")&"", ",", "", 1), | |
| IF( | |
| FIND(",", ARRAYJOIN(ARRAYUNIQUE(values), ",")&"", LEN(ARRAYJOIN(ARRAYUNIQUE(values), ",")&"") - 1), | |
| LEFT(ARRAYJOIN(ARRAYUNIQUE(values), ",")&"", LEN(ARRAYJOIN(ARRAYUNIQUE(values), ",")&"") - 1), | |
| ARRAYJOIN(ARRAYUNIQUE(values), ",")&"" | |
| ) | |
| ) | |
| ) | |
| - | |
| LEN(SUBSTITUTE( | |
| IF( | |
| FIND(",", ARRAYJOIN(ARRAYUNIQUE(values), ",")&"") = 1, | |
| SUBSTITUTE(ARRAYJOIN(ARRAYUNIQUE(values), ",")&"", ",", "", 1), | |
| IF( | |
| FIND(",", ARRAYJOIN(ARRAYUNIQUE(values), ",")&"", LEN(ARRAYJOIN(ARRAYUNIQUE(values), ",")&"") - 1), | |
| LEFT(ARRAYJOIN(ARRAYUNIQUE(values), ",")&"", LEN(ARRAYJOIN(ARRAYUNIQUE(values), ",")&"") - 1), | |
| ARRAYJOIN(ARRAYUNIQUE(values), ",")&"" | |
| ) | |
| ) | |
| , ",", "")) + 1) |
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Note: This returns
BLANK()for any empty rollup. If you'd prefer it to return 0, replace the final)with, 0)