sql - different results when using query with variables and without variables -

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i have query filter records in specific datetime range. testing purpose create query variables , not returning expected result.

here query:

declare @vtimefrom datetime = '2015-04-22 20:00:00.000' declare @vtimeto datetime =   '2015-04-23 08:00:00.000' declare @ptime  datetime = '2015-04-22 21:00:00.000'  select @ptime convert(varchar(5),@ptime,108)  between convert(varchar(5),@vtimefrom,108) , convert(varchar(5),@vtimeto,108)

it outputs:

no record found

the above query returns nothing.

but consider query :

declare @vtimefrom datetime = '2015-04-22 20:00:00.000' declare @vtimeto datetime =   '2015-04-23 08:00:00.000' declare @ptime  datetime = '2015-04-22 21:00:00.000'   select @ptime convert(varchar(5),'2015-04-22 21:00:00.000',108)  between convert(varchar(5),'2015-04-22 20:00:00.000',108)   , convert(varchar(5),'2015-04-23 08:00:00.000',108)

it outputs:

april, 22 2015 21:00:00

convert(varchar(5),'2015-04-22 21:00:00.000',108) left('2015-04-22 21:00:00.000', 5). in first case you're checking time , in second case you're checking strings.

declare @vtimefrom datetime = '2015-04-22 20:00:00.000' declare @vtimeto datetime =   '2015-04-23 08:00:00.000' declare @ptime  datetime = '2015-04-22 21:00:00.000'  select     convert(varchar(5),@ptime,108),     convert(varchar(5),@vtimefrom,108),     convert(varchar(5),@vtimeto,108),     convert(varchar(5),'2015-04-22 21:00:00.000',108),     convert(varchar(5),'2015-04-22 20:00:00.000',108),     convert(varchar(5),'2015-04-23 08:00:00.000',108)  ------------------------------------------------------ 21:00   20:00   08:00   2015-   2015-   2015-

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