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If you would like to count (not count_distinct) a field that is not the primary key, you can do this by creating a measure of type: number and performing the count in the sql parameter:
measure: count_states {
type: number
sql: COUNT(${state}) ;;
}
This measure will generate the following SQL:
COUNT(users.state)
Measures of type: count_distinct can make use of a filters field parameter, while measures of type: number cannot. In addition, while this does not apply to COUNT DISTINCT, other aggregation types — like SUM, AVERAGE, and COUNT — should be represented with specific measure types rather than number.
These difference allow Looker to properly apply symmetric aggregates in order to avoid fanout values when exploring and using aggregations.
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