subtract specific time period from a time sql

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Im trying to subtract a specific time (eg. 1 hour 15 mins) from a time (eg. 12:00:00).

Currently i have tried

(TIMESTART - '01:30:00')
(TIMESTART - 013000)

Any help would be greatly appreciated. Thanks in advance

Posted 10-Jan-14 19:09pm

nebiam

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Tadit Dash (ତଡିତ୍ କୁମାର ଦାଶ) 11-Jan-14 1:27am

What have you tried and where is the issue?

3 solutions

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Peter Leow · Answer 1 · 2014-01-10T19:52:00

Solution 1

Use DATEADD() and DATEPART(), read this: dateadd()[^] and
datepart()[^]
Let me give you one example, say one hour ago:

SELECT DATEPART(hour, DATEADD(hour, -1, GETDATE()))

Try to work out the solution yourself.

Posted 10-Jan-14 19:52pm

Peter Leow

Updated 10-Jan-14 20:14pm

v3

Comments

nebiam 11-Jan-14 2:15am

Im trying to work it into a case statement but it doesnt like it...

CASE
WHEN example = 'A' THEN DATEADD(hour, -1, TIMESTART)
ELSE TIMESTART
END AS STARTTIME

nebiam 11-Jan-14 2:16am

where TIMESTART eg. '12:00:00'

Christian Graus · Answer 2 · 2014-01-12T13:06:00

You said this does not work:

VB

CASE
WHEN example = 'A' THEN DATEADD(hour, -1, TIMESTART)
    ELSE TIMESTART
    END AS STARTTIME

Well, dateadd works with a date, and returns a date. TIMESTART appears to be a string which represents a time.

try

VB

CASE
WHEN example = 'A' THEN convert(time, DATEADD(hour, -1, TIMESTART))
    ELSE convert(time, TIMESTART)
    END AS STARTTIME

case requires everything you return has the same type.

nebiam · Answer 3 · 2014-01-23T13:41:00

Solution 3

This is the solution that worked in the end. Thanks for all the suggestions though. In DB2 you can actually add/subtract time like this.

CASE
WHEN example = 'A' THEN TIMESTART - 30 MINUTES
ELSE TIMESTART
END AS STARTTIME

Posted 23-Jan-14 13:41pm