计算两个日期之间的时差

Question

I have data similar to the following:

`date1`     `date2`
2013-04-02  NULL    
2013-03-26  NULL
2013-03-26  2013-03-06
2013-03-25  2013-03-05

I would like to find the difference in days. For example:

`date1`     `date2`    `difference`
2013-04-02  NULL        NULL
2013-03-26  NULL        NULL
2013-03-26  2013-03-27  1.0 # DAYS 
2013-03-25  2013-03-28  3.0    

How would I calculate this difference?

Answer 1

You can use a DATEDIFF function.

DATEDIFF(date1,date2)

The following SELECT statement:

SELECT DATEDIFF('2014-11-30','2014-11-29') AS DiffDate

Output will be.

DiffDate
1