How to count number of unique records of a field in progress openedge 4gl? -

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i have customer table field age . how can count how many distinct ages there ?

you can in abl using for-loop , break , counter. there built in aggregate functions (accum) in abl seen in wild...

define variable integer     no-undo.  each record no-lock break record.age:     if last-of(record.age) do:         = + 1.     end. end. message "there " " unique ages" view-as alert-box.

or crippled built in sql:

select count(distinct age) record.

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