st: "unique" with "by"

["Shige Song" <shigesong@gmail.com>]

Dear Collegues,

I want to get count of unique values of a variable and I want to use
it conjuction with "by" like this:

sort hhid
by hhid: unique id

But unfortunately the UNIQUE command does not allow the use of "by".
Are there other options? Thanks!

Best,
Shige

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