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Selecting COUNT(*) with DISTINCT

In SQL Server 2005 I have a table cm_production that lists all the code that’s been put into production. The table has a ticket_number, program_type, program_name and push_number along with some other columns.

GOAL: Count all the DISTINCT program names by program type and push number.

What I have so far is:

This gets me partway there, but it’s counting all the program names, not the distinct ones (which I don’t expect it to do in that query). I guess I just can’t wrap my head around how to tell it to count only the distinct program names without selecting them. Or something.

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Answer

Count all the DISTINCT program names by program type and push number

DISTINCT COUNT(*) will return a row for each unique count. What you want is COUNT(DISTINCT <expression>): evaluates expression for each row in a group and returns the number of unique, non-null values.

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