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you could do a custom column with a formula similar to what Brian showed, then do not display the native columns or hide them. I believe that you do not have to 'select' a column in order to be able to use it in a custom formula. I will be honest, I ...
Maggie, Our locked down version of Looker is terrible for certain things. Try adding a measure of an item (count, sum, whatever). I think that's the only way you'll really 'group by' in Looker.
Sorry I should have been specific. This is a custom explore using Looker. ------------------------------ Maggie Brown Data Analyst Lutheran Services in Iowa, Inc. Des Moines IA ------------------------------