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Last tested: Aug 25, 2020
A yesno field will only evaluate a single thing. If we have a boolean coming in from the database, we can set the yesno field to something like this:
dimension: yesno_field
type: yesno
sql: ${TABLE}.boolean_database_column ;;
When that database column is true, we get a "Yes", and when it is no we will get a "No". However, we will also get a "No" if the row is null, since it does not meet the single evaluation of the boolean being true. This can become tricky if we are using this field in a filtered measures. That is, we may get cases where the row does not meet the criteria, but is also not a false value on the DB. A better solution if there are null values is a LookML CASE statement.
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