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Detect Duplicate Values

Posted on 2004-09-28
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Last Modified: 2008-02-01
Hello Experts,
Here's a simple one :-)
I have a table with (simplified) these fields:
DateTime, PhoneNumber, Duration.
I want to find
(A) a phone number that was called 5 times during a datetime interval (let's say, between '2004-09-20 08:00:00' and '2004-09-25 20:00:00' , and know the DateTime value for that. What's the SQL statement I should use?
and
(B) the same as (A), but I want to narrow down the datetime interval per day. For example, the first day between 1pm and 1:30 pm, the second day between 9:15 am and 9:35 am, etc.
I'm not a SQL expert, so please be precise and complete in your syntax.
Thanks!
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Question by:drotkopf
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5 Comments
 
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Expert Comment

by:geotiger
ID: 12173130
(A)

select phonenumber, count(*) as cnt
from your_table
where [DATETIME] between cast('2004-09-20 08:00:00' as datetime ) and cast('2004-09-25 20:00:00' as datetime )
having count(*) = 5
group by phonenumber;

(B) the same with specific time period:

select phonenumber, count(*) as cnt
from your_table
where [DATETIME] between cast('2004-09-20 13:00:00' as datetime ) and cast('2004-09-20 13:30:00' as datetime )
Or [DATETIME] between cast('2004-09-21 09:15:00' as datetime ) and cast('2004-09-21 09:35:00' as datetime )
having count(*) = 5
group by phonenumber;
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LVL 69

Expert Comment

by:ScottPletcher
ID: 12173226
I may have misinterpreted your q, but if not, I think the second one is somewhat trickier than that because you could have 5 calls within one time period only and presumably you wouldn't want a match then, that is, only match if there was at least one call in every different period and 5 overall, say.  

If I have misinterpreted, please let me know.

Something like this should guarantee at least one call in each time period and a certain number overall:


SELECT phoneNumber, time1Count + time2Count AS [Total Calls]
FROM (
      SELECT phonenumber,
            SUM(CASE WHEN [datetime] BETWEEN '2004-09-20 13:00:00' AND '2004-09-20 13:30:00' THEN 1 ELSE 0 END) AS time1Count,
            SUM(CASE WHEN [datetime] BETWEEN '2004-09-21 09:15:00' AND '2004-09-21 09:35:00' THEN 1 ELSE 0 END) AS time2Count
      FROM yourTable
      GROUP BY phonenumber
) AS derived
WHERE time1Count > 0 AND time2Count > 0
AND (time1Count + time2Count) >= 5
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Author Comment

by:drotkopf
ID: 12173808
geotinger: it works fine, but I'm getting too many answers (750+).

ScottPletcher: you  had a very good idea, however, please check it, because I'm getting 0 records as result, even though I'm entering from 1 am to 11 pm (calls are made 8-8). If I'm getting 750+ using geotinger's, I should get them with you statement also when using the 1 am to 11 pm range for each of the days. Am I wrong?
Also, I think we can do away with (time1Count + time2Count + ...) >= 5 because that comes automatic with WHERE time1Count > 0 AND time2Count > 0... Isn't it?

I'd appreciate you input.
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LVL 69

Accepted Solution

by:
ScottPletcher earned 125 total points
ID: 12173846
>>  I should get them with you statement also when using the 1 am to 11 pm range for each of the days. Am I wrong? <<

No, not necessarily.  With my version, you would only get phoneNumbers that had called on *every* day, not just multiple times on the same day.
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LVL 69

Expert Comment

by:ScottPletcher
ID: 12173856
>> Also, I think we can do away with (time1Count + time2Count + ...) >= 5 because that comes automatic with WHERE time1Count > 0 AND time2Count > 0... Isn't it? <<

You're right, depending on the number of different date ranges.  If you have five different ranges, and only require a total of 5 or more, then yes, you don't need it.  But of course if you have only 2 or 3 different ranges but want a total of 5 calls, then you will need to compare the total also.
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