Try this
select * from _dates d
left outer join cannedbackupjobs dbj on d.d = CONVERT(VARCHAR(10), dbj.starttime, 120)
where d.d between (select min(starttime) from cannedbackupjobs) and (select max(starttime) from cannedbackupjobs);
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Deja View - The strange feeling that somewhere, sometime you've optimised this query before
How to get the best help on a forum
http://www.sqlservercentral.com/articles/Best+Practices/61537