On Wednesday 14 May 2008 18:02:42 Olexandr Melnyk wrote: > It doesn't return no rows, it returns row(s) with a single column set to a > NULL value. In case one of the arguments is NULL, CONCAT() will return > NULL. > > To replace the value of one of the fields with an empty string when it's > NULL, you can use something like: CONCAT(COAESCE(a, ''), ' ', COAESCE(b, > ''))
or CONCAT_WS IIRC W > > On 5/14/08, Afan Pasalic <[EMAIL PROTECTED]> wrote: > > hi, > > > > I have query > > SELECT CONCAT(r.first_name, ' ', r.last_name, '\n', r.organization, '\n', > > r.title, '\n', a.address1, '\n', a.city, ', ', a.state, ' ', a.zip, '\n', > > r.email) > > FROM registrants r, addresses a > > WHERE r.reg_id=121 > > > > if any of columns has value (e.g. title) NULL, I'll get as result 0 > > records. > > If query doesn't have concat() - it works fine. > > > > Why is that? > > > > -afan > > > > -- > > MySQL General Mailing List > > For list archives: http://lists.mysql.com/mysql > > To unsubscribe: http://lists.mysql.com/[EMAIL PROTECTED] -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe: http://lists.mysql.com/[EMAIL PROTECTED]
