Re: [MS_AccessPros] randomly chosen groups

 

Hi Russ

 

You don't actually need the Mod operation, because the Rnd() function returns a number between 0 and 0.99999999…  Thus, multiplying the result by 4 will give a number between 0 and 3.99999999…

 

You need to use the Int function to ensure this result is always rounded DOWN, and then finally add 1 if you want (1,2,3,4) instead of (0,1,2,3).

Thus, your UPDATE query  will look something like this:

UPDATE [Your Table Name] SET [Group Number]=Int(Rnd([House Number]) * 4) + 1;

Best regards,

Graham

---In MS_Access_Professionals@yahoogroups.com, <dyspoz2@...> wrote :

John,

Should I put this in the query field where I want the random number applied?  Such as in the Group Number field?  And I do want the groups to be numbered 1-4 so would the statement be modified like this?

Group:  (Rnd([Household Number]) * 4) Mod 5

Russ

You can use the Rnd function to do what you want in a query.

Group:  (Rnd([Household Number]) * 4) Mod 4

That will give you a random number between 0 and 3 to assign your groups.  Add 1 if you want groups 1 through 4.  Use that in an UPDATE query to assign the values.

NOTE:  You WILL get random numbers, but there's no guarantee that an equal number of households will be assigned to each group.

John Viescas, Author

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Posted by: graham@mandeno.com

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