grouping datetime by single days

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grouping datetime by single days

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Topic

sqlchiq
Posting Yak Master

133 Posts

Posted - 2008-08-14 : 16:27:10

I have a bunch of entries that are like

8/8/2008 5:45:33 PM
8/8/2008 5:45:41 PM
8/8/2008 5:45:50 PM
8/8/2008 5:45:41 PM
8/8/2008 5:45:59 PM

But are essentially 8/8/2008 (in nvarchar datatype)

I was wondering if there was a simple way to change all of it into

smalldatetime

8/8/2008 0:00:00

or whatever

jdaman
Constraint Violating Yak Guru

354 Posts

Posted - 2008-08-14 : 16:57:48

dateadd(dd, datediff(dd, 0, YourDateHere), 0)

madhivanan
Premature Yak Congratulator

22864 Posts

Posted - 2008-08-18 : 04:26:01

dateadd(dd, datediff(dd, 0, cast(YourDateHere as datetime)), 0)

Madhivanan

Failing to plan is Planning to fail

visakh16
Very Important crosS Applying yaK Herder

52326 Posts

Posted - 2008-08-18 : 04:36:22

quote:
Originally posted by madhivanan

dateadd(dd, datediff(dd, 0, cast(YourDateHere as datetime)), 0)

Madhivanan

Failing to plan is Planning to fail

just a doubt wont the nvarchar value be implicitly casted? is there a need for explicit casting?

madhivanan
Premature Yak Congratulator

22864 Posts

Posted - 2008-08-18 : 05:08:32

quote:
Originally posted by visakh16

quote:
Originally posted by madhivanan

dateadd(dd, datediff(dd, 0, cast(YourDateHere as datetime)), 0)

Madhivanan

Failing to plan is Planning to fail

just a doubt wont the nvarchar value be implicitly casted? is there a need for explicit casting?

Once I got convertion failed error but I am not able to reproduce it now

Madhivanan

Failing to plan is Planning to fail

visakh16
Very Important crosS Applying yaK Herder

52326 Posts

Posted - 2008-08-18 : 05:24:37

quote:
Originally posted by madhivanan

quote:
Originally posted by visakh16

quote:
Originally posted by madhivanan

dateadd(dd, datediff(dd, 0, cast(YourDateHere as datetime)), 0)

Madhivanan

Failing to plan is Planning to fail

just a doubt wont the nvarchar value be implicitly casted? is there a need for explicit casting?

Once I got convertion failed error but I am not able to reproduce it now

Madhivanan

Failing to plan is Planning to fail

Ok. just checked as i didnt get one

SwePeso
Patron Saint of Lost Yaks

30421 Posts

Posted - 2008-08-18 : 06:44:13

UPDATE Table1
SET Col1 = LEFT(Col1, CHARINDEX(' ', Col1)) + '00:00:00 AM'

E 12°55'05.25"
N 56°04'39.16"

TG
Master Smack Fu Yak Hacker

6065 Posts

Posted - 2008-08-18 : 08:36:08

quote:
Originally posted by visakh16
just a doubt wont the nvarchar value be implicitly casted? is there a need for explicit casting?

I personally like to do the explicit casts/converts if I want the result in a specific datatype. One reason is I don't want to count different/future versions to behave the same way, and another reason is for the benefit of other developers so they can easily see what my intentions were. It is not necessary but it is a convention that I started using. When I remember to :)

Be One with the Optimizer
TG

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