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IDS Forum

Re: SQL Query Syntax Question

Posted By: Richard Snoke
Date: Friday, 9 April 2010, at 2:45 p.m.

In Response To: SQL Query Syntax Question (Jamie Gedye)

There are two uses of the COUNT function, and I don't think that's
allowed. You can fake a non-distinct count using SUM and CASE, but I
can't think of a way to fake a COUNT(DISTINCT...).

Cheers,
Dick Snoke
Executive IT Specialist
IBM Software Group - ChannelWorks

Tel: (404) 487-1595
Email: dsnoke@us.ibm.com

From:
"Jamie Gedye" <jgedyedba@teleformix.com>
To:
ids@iiug.org
Date:
04/09/10 12:36 PM
Subject:
SQL Query Syntax Question [19589]

I have a kind of strange syntax error happening on a select statement, and
I
need a little help.

Engine 11.50FC6W2 - Red Hat Linux

I have a table that tracks transactions of a telephone call. The table has

4 columns:

transid serial,
userid char(30),
callrec char(32),
transstart datetime year to second,
transend datetime year to second

Each phone call will have a unique callrec, and a phone call can have
multiple transactions.

So I'm trying to get total transactions, total duration, average
transaction
duration, min transaction duration, max transaction duration, total calls
and average call duration for a given userid for a given date range.

Here's the query that I came up with

SELECT
COUNT(*) as total_transactions,
SUM(((transend - transstart)::interval second(9) to
second)::char(10)::int8)/3600 as total_trans_duration, SUM(((transend -
transstart)::interval second(9) to
second)::char(10)::int8)/count(*) as avg_trans_duration, SUM(((transend -
transstart)::interval second(9) to
second)::char(10)::int8) as min_trans_duration, SUM(((transend -
transstart)::interval second(9) to
second)::char(10)::int8) as max_trans_duration, COUNT(UNIQUE callrec) as
total_calls, (SUM(((transend - transstart)::interval second(9) to
second)::char(10)::int8) / COUNT(UNIQUE callrec)/60 as avg_call_duration
FROM calltrans WHERE transstart BETWEEN ? AND ?
AND userid = ?

The statement works perfectly except for the last column for
avg_call_duration.

I get a syntax error on the COUNT(UNIQUE callrec) part of the statement.

I can use COUNT(*) without any error, and I can use COUNT(ALL callrec) or
COUNT(callrec) without error.

I just can't use UNIQUE or DISTINCT with COUNT in the calculation. The
COUNT(UNIQUE callrec) for total_calls works perfectly.

I know I can do this in a stored procedure, but I really wanted to get
this
done with one statement.

I read through the 11.50 SQL docs on aggregate functions, and unless I'm
reading it wrong, it should work.

Am I wrong or could this be a bug?

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