SQL, how to cast the timestamp to the same format

Hi Experts,

In table A, the column " created on" has value "2015-06-02 10:27:11.787"
In table B, the column " submittedtimestamp" has value "2015-06-02 10:27:11.780"

I want to make those 2 columns to the same format, which means 2015-06-02 10:27=2015-06-02 10:27

select *
from A a inner join B b on a. createdon = b. submittedtimestamp

Can you help me on the query.

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Vitor MontalvãoMSSQL Senior EngineerCommented:
But they are in the same format. Only the values are slightly different.
You can use CAST to compare them but you'll lose performance if they are indexed:
select * 
 from A a inner join B b on CAST(a. createdon AS SMALLDATETIME)= CAST(b. submittedtimestamp AS SMALLDATETIME)

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Scott PletcherSenior DBACommented:
You can't avoid some amount of conversion.  But, for best performance, convert only one column, usually the one from the smaller table.  For example, say table A is very small compared to table B:

select *
from A a
inner join B b on b. submittedtimestamp >= dateadd(minute, datediff(minute, 0, a.createdon), 0) and b. submittedtimestamp < dateadd(minute, datediff(minute, 0, a.createdon) + 1, 0)
tanj1035Author Commented:
Thanks for the hint, Scott.
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