Hi, I've read reacently, that it's not good to use columns with NULL values in MySQL, because it slows down the select queries over that columns. Is it true? Or do that affects only some situations or some versions? Are there some relevant statistics about that?
Thanks a lot, Ales On 3/29/07, Reinhart Viane <[EMAIL PROTECTED]> wrote:
Hello list, I have a table events in a database that has a field named duration. This field is a mediumint containing an amount of minutes (eg 65, 87, 10368) Now I need these to be outputted into a h:mm (so 65 will be represented as 1:05) My complete query is: select YEAR(events.workdate) as theyear, (sum(events.duration)/60),clients.name, persons.name from events, persons, clients where events.personid= persons.personid and events.clientid= clients.clientid group by clients.name, events.personid, theyear; this does, off course not give me the wanted result. How can I convert these numerical entries to hh:mm in my query? (days do not matter, I just need hours and minutes, thx) Regards and thanks, Reinhart Viane D-studio Graaf van Egmontstraat 15/3 2800 Mechelen [EMAIL PROTECTED] +32(0)15 44 89 01 -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe: http://lists.mysql.com/[EMAIL PROTECTED]
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