Ok, I've tried that but it gave me an error. I have a more complex query that use more tables, and I need to specify something like:
count(table_name.*) ... but here MySQL tells me that there is an error near this expression, so I need to use instead: count(table_name.a_column_name) I would like to use: count(table_name.*) ... group by a_column_name ... but this won't work because this query not only that will give me that error, but I want to take the distinct values of the a_column_name only for non null values, and for null values I want to count them all thinking that they are different values. In fact, the null values should be considered different values when using "distinct". Teddy, Teddy's Center: http://teddy.fcc.ro/ Email: [EMAIL PROTECTED] ----- Original Message ----- From: "Paul DuBois" <[EMAIL PROTECTED]> To: "Octavian Rasnita" <[EMAIL PROTECTED]>; "Daniel Kiss" <[EMAIL PROTECTED]>; <[EMAIL PROTECTED]> Sent: Wednesday, February 12, 2003 7:09 PM Subject: Re: Counting null values At 9:41 +0200 2/12/03, Octavian Rasnita wrote: >It won't work because MySQL doesn't count null values. It depends. count(FieldName) will not count NULL values count(*) will, because it counts rows, not values. > >Teddy, >Teddy's Center: http://teddy.fcc.ro/ >Email: [EMAIL PROTECTED] > >----- Original Message ----- >From: "Daniel Kiss" <[EMAIL PROTECTED]> >To: <[EMAIL PROTECTED]> >Sent: Tuesday, February 11, 2003 8:18 AM >Subject: Re: Counting null values > > >Hi Octavian, > >Try this: > >select FieldName, count(*) from TableName group by FieldName > >Bye, > Danny > >At 16:39 2003.02.08._+0200, you wrote: >>Hi all, >> >>I have a table where I have something like this: >> >>| abc | >>| abc | >>| xxx | >>| null | >>| null | >>| null | >> >>I want to count these lines to give the result 5, meaning a distinct count >>for values which are not null, and counting all the null values. >> >>This means 1 for "abc", one for "xxx", and 3 for null values. >> >>Can you tell me what sql query should I use for counting this? >> >>Thank you. >> >> >>Teddy, >>Teddy's Center: http://teddy.fcc.ro/ > >Email: [EMAIL PROTECTED] --------------------------------------------------------------------- Before posting, please check: http://www.mysql.com/manual.php (the manual) http://lists.mysql.com/ (the list archive) To request this thread, e-mail <[EMAIL PROTECTED]> To unsubscribe, e-mail <[EMAIL PROTECTED]> Trouble unsubscribing? Try: http://lists.mysql.com/php/unsubscribe.php
