check if data is older than 24 hours

hi guys

i have a table customer that has following columns

customer-ID  insert_time
100                2013-05-17 8:17:32.197
200                2013-05-15 18:17:32.197


how can i write a sql which will bring me data older than a day
I am trying to do
( CONVERT (date, SYSDATETIME()) - cast(insert_time AS Date) ) > 1


but get error

Operand data type date is invalid for subtract operator.


any ideas appreaited
thanks
royjaydAsked:
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Patrick MatthewsConnect With a Mentor Commented:
If you mean "only return it if insert_time was more than 24 hours ago":

SELECT customer_ID, insert_time
FROM customer
WHERE insert_time < DATEADD(hour, -24, GETDATE())

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Ross TurnerConnect With a Mentor Management Information Support AnalystCommented:
Try
Where datediff(hour,insert_time,getdate()) <24
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Patrick MatthewsCommented:
If you really mean, "older than yesterday"...

SELECT customer_ID, insert_time
FROM customer
WHERE insert_time < DATEADD(day, DATEDIFF(day, 0, GETDATE()) - 1, 0)

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Patrick MatthewsCommented:
Try
Where datediff(hour,insert_time,getdate()) <24

Be careful with DATEDIFF.  DATEDIFF does NOT measure elapsed time.  Rather, it measures time period boundaries.

Consider this expression:

DATEDIFF(hour, '2013-05-01 00:59:59', '2013-05-02')

That will return 24, even the true elapsed time is 23:00:01.

The smaller the interval you use with DATEDIFF, the smaller the possible error--for example, using seconds you would never be off by more than a second--but there is still the possibility of error.
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