max() can't work
select * from table_name where movid = max(movid); why the sql above can't work? Shall I use a sub-select instead? select * from table_name where movid = (select max(movid) from table_name) ? Thanks in advance. -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe:http://lists.mysql.com/mysql?unsub=arch...@jab.org
Re: max() can't work
the field movid is type integer or varchar ? 2010/2/6 tech list bluetm...@gmail.com select * from table_name where movid = max(movid); why the sql above can't work? Shall I use a sub-select instead? select * from table_name where movid = (select max(movid) from table_name) ? Thanks in advance. -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe:http://lists.mysql.com/mysql?unsub=armand...@gmail.com -- ing. paredes aguilar, armando http://www.sinapsisperu.com/ Desarrollador
Re: max() can't work
The max() function is an aggregate function which can be used in conjunction with GROUP BY in the SELECT or HAVING clause: http://dev.mysql.com/doc/refman/5.0/en/group-by-functions.html . This code should work: select * from table_name group by movid having max(movid). However, there is a simpler and more efficient solution: select * from table_name order by movid desc limit 1. I hope this helps. Best regards Roland Kaber armando wrote: the field movid is type integer or varchar ? 2010/2/6 tech list bluetm...@gmail.com select * from table_name where movid = max(movid); why the sql above can't work? Shall I use a sub-select instead? select * from table_name where movid = (select max(movid) from table_name) ? Thanks in advance. -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe:http://lists.mysql.com/mysql?unsub=armand...@gmail.com
Re: max() can't work
Yes - you must use the subselect. Or, you can set a variable like: select @max := max(movid) from table_name; select * from table_name where movid = @max; On Sat, Feb 6, 2010 at 8:34 AM, tech list bluetm...@gmail.com wrote: select * from table_name where movid = max(movid); why the sql above can't work? Shall I use a sub-select instead? select * from table_name where movid = (select max(movid) from table_name) ? Thanks in advance. -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe:http://lists.mysql.com/mysql?unsub=jlyons4...@gmail.com -- Jim Lyons Web developer / Database administrator http://www.weblyons.com
Re: max() can't work
hi It is not working, select * from table_name group by movid having max(movid) but it is working fine select * from table_name order by movid desc limit 1 From: Roland Kaber roland.ka...@education.lu To: armando armand...@gmail.com Cc: tech list bluetm...@gmail.com; mysql@lists.mysql.com Sent: Sat, 6 February, 2010 8:28:06 PM Subject: Re: max() can't work The max() function is an aggregate function which can be used in conjunction with GROUP BY in the SELECT or HAVING clause: http://dev.mysql.com/doc/refman/5.0/en/group-by-functions.html . This code should work: select * from table_name group by movid having max(movid). However, there is a simpler and more efficient solution: select * from table_name order by movid desc limit 1. I hope this helps. Best regards Roland Kaber armando wrote: the field movid is type integer or varchar ? 2010/2/6 tech list bluetm...@gmail.com select * from table_name where movid = max(movid); why the sql above can't work? Shall I use a sub-select instead? select * from table_name where movid = (select max(movid) from table_name) ? Thanks in advance. -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe:http://lists.mysql.com/mysql?unsub=armand...@gmail.com The INTERNET now has a personality. YOURS! See your Yahoo! Homepage. http://in.yahoo.com/
Re: max() can't work
Why in the world would you think select * from table_name group by movid having max(movid) would work? It seems to compile without errors but doesn't give you what you seem to want. This would work: select * from table_name group by movid having movid = (select max(movid) from table_name) although then your' not really grouping so the GROUP BY is useless. On Sat, Feb 6, 2010 at 11:01 AM, Vikram A vikkiatb...@yahoo.in wrote: hi It is not working, select * from table_name group by movid having max(movid) but it is working fine select * from table_name order by movid desc limit 1 From: Roland Kaber roland.ka...@education.lu To: armando armand...@gmail.com Cc: tech list bluetm...@gmail.com; mysql@lists.mysql.com Sent: Sat, 6 February, 2010 8:28:06 PM Subject: Re: max() can't work The max() function is an aggregate function which can be used in conjunction with GROUP BY in the SELECT or HAVING clause: http://dev.mysql.com/doc/refman/5.0/en/group-by-functions.html . This code should work: select * from table_name group by movid having max(movid). However, there is a simpler and more efficient solution: select * from table_name order by movid desc limit 1. I hope this helps. Best regards Roland Kaber armando wrote: the field movid is type integer or varchar ? 2010/2/6 tech list bluetm...@gmail.com select * from table_name where movid = max(movid); why the sql above can't work? Shall I use a sub-select instead? select * from table_name where movid = (select max(movid) from table_name) ? Thanks in advance. -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe: http://lists.mysql.com/mysql?unsub=armand...@gmail.com The INTERNET now has a personality. YOURS! See your Yahoo! Homepage. http://in.yahoo.com/ -- Jim Lyons Web developer / Database administrator http://www.weblyons.com
