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Help with Data SUPPORT and LIFT [message #310883]

Wed, 02 April 2008 13:51

jlbovo
Messages: 8
Registered: February 2008

Junior Member

I need a little help with a problem. I have to come up with Association Rules for a table that I have. I must also do the support and lift for them.

Is there an easy way to calculate this, for the table has over 800 records.

I have done the COUNT function to get a count of single items from the table. I must do them for two items and some have three or more items and I can not get a count to COUNT all.

For example, I used this code to count how many records were on Monday.

SELECT COUNT(DAY_ID)
FROM FACT5
WHERE DAY_ID = 1;

....and then I used this code to find Males in the tables..

SELECT COUNT(SEX_ID)
FROM FACT5
WHERE SEX_ID = 1;

How do i find out how many records have Monday(day_id = 1) and that are Males(sex_id = 1).

Any help would be appreciated.
Thanks - Justin.

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Re: Help with Data SUPPORT and LIFT [message #310889 is a reply to message #310883]

Wed, 02 April 2008 13:55

Littlefoot
Messages: 21823
Registered: June 2005
Location: Croatia, Europe

Senior Member
Account Moderator

Include all conditions into the WHERE clause, such as

SELECT COUNT(*)
FROM fact5
WHERE day_id = 1
  AND sex_id = 1;

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Re: Help with Data SUPPORT and LIFT [message #310899 is a reply to message #310883]

Wed, 02 April 2008 14:48

flyboy
Messages: 1903
Registered: November 2006

Senior Member

Alternatively (when combining with another counts), you may use CASE expression inside the COUNT function:

SELECT COUNT( CASE WHEN day_id = 1 AND sex_id = 1 THEN 1 END )
FROM fact5;

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