Question

I’ve seen a very few questions like this one but none have a solution that quite works with with the structure I have.

My current query creates a table with 4 columns, 2 of which are dates.

I declare this as a table @tblTransactions which I later call in a select statement.
I need the final select statement to have a 5th column which shows the number of days between the two dates.

SELECT *
       ,(t.PremDueDate - t.LastTdate) AS 'tpFactor'          <-------- This doesn't work
FROM
       @tblTransactions t

the above code obviously doesn’t work since PremDueDate and LastTdate are both of datatype date.

Using SQL Server Management Studio 2010

Answer 1

Use DATEDIFF() to get the number of days between two dates:

SELECT DATEDIFF(DAY, t.PremDueDate, t.LastTdate) AS 'tpFactor'
FROM @tblTransactions t