I'd like to compute the average age of my users for statistical information.

Any ideas on how to write this query?

The query:
You might want to round() it later, or you can do it directly in the query using MySQL's ROUND() function, for example:
will round it to 2 decimal points.

How can I eliminate the ones that didn't input a year?

wow sweet!

Where would I put this code and where would I recieve the results!

[QUOTE]Originally posted by pgowder
How can I eliminate the ones that didn't input a year?

Here is what I tried:

[QUOTE]SELECT YEAR(NOW())-AVG(YEAR(birthday)) AS avgage
WHERE birthday != 0000-00-00 FROM user

After FROM user:
That doesn't error, but I got a strange result. My average user is 216 years old. :)

I think it may be because we are excluding the the unset year cells but the total rows aren't changing when the average is calculated.

could someone answer me please!

Thanks!

I wasn't aware of the YEAR() function, I will have to check that out.

[QUOTE]Originally posted by freddie

Code:

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SELECT YEAR(NOW())-AVG(YEAR(birthday)) AS avgage FROM user WHERE YEAR(birthday) <> 0

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I wasn't aware of the YEAR() function, I will have to check that out.