sql server 2008 r2 - Convert nvarchar to date in query -

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i have date value in string below how can query against date. how need query evtdate nvarchar , has date value 2013-07-18 06:30:30.843000000

declare @yesterday datetime - dateadd(day,diff(day,1,getdate(),0) select count(*) tbl1 evtdate >= dateadd(hour,10,@yesterday)

or

select count(*) tbl1 evtdate >- dateadd(day,'20010102',getdate()-2),'2001-01-01t10:00:00')

i assume in question want count rows in 24-hour period, starting 10 yesterday, (but not including) 10 today.

declare @yesterday datetime = dateadd(day, datediff(day,1,getdate()),0);  select count(*) dbo.tbl1 convert(datetime, evtdate) >= dateadd(hour, 10, @yesterday)   , convert(datetime, evtdate) <  dateadd(hour, 34, @yesterday);

i recommend change evtdate nvarchar datetime (and consider indexing if query pattern common). column has absolutely no business whatsoever being nvarchar - varchar bad enough, nvarchar not losing built-in validation , date/time methods, you're storing 2 bytes every character, though datetime never have characters require unicode. , how prevent storing 'floob' or 'jimmy hoffa' in column?


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