[Koha] group by hour sql?

[Ian Trim]

Hi all
Looking to see busy times in the library. Can you GROUP BY hour? If so, how?

Query so far:
mysql> select count(*),datetime from statistics where type='return' and date(datetime)='2010-04-12' and branch='k' group by datetime;

Cheers 
Ian

Ian Trim
Circulation Services Librarian 
Te Kaitiaki Pukapuka Wāhi Tuku
Paraparaumu Library
9 Iver Trask Place 
Paraparaumu
04 2964 797
Skype ian.trim 

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