how to count total number of hours and days from date and time in sql querry?

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how to count total number of hours and days from date and time in sql querry?


My table Is-


Id CheckInDate   CheckInTime     CheckOutDate    CheckOutTime

1  2014-12-28   09 : 29 : AM    2014-12-30  06 : 29 : AM

2  2014-12-27   11 : 30 : AM    2014-12-30  12 : 30 : PM



Please solve this problem?

Posted 27-Dec-14 22:13pm

Abhishek Burrnwal

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OriginalGriff · Answer 1 · 2014-12-27T22:38:00

Change your database.
Stop storing dates and times as NVARCHAR, and stop storing them separately. Always store dates and times together, so they form a single "moment in time" in DATETIME variables.
Then you can just use the DATEDIFF function[^] which returns what you want.

If you store them as strings, you have to validate and convert them every single time you want to use them, and that's bad. A single error that manages to get into your DB will mess up all your queries.