Question

Im trying to do this

SELECT     CAST(date AS datetime) + CAST(time AS datetime) AS NewDT, variable, value
FROM         batch
WHERE     (NewDT <= @BatchStartDate)

But i get the error “Invalid colum name NewDT”
The problem is that date and time is in two colums in the database.

Answer 1

Guessing you are using MS SQL Server. You can’t reference an alias on the WHERE clause, you should use the full CAST(date AS datetime) + CAST(time AS datetime) so it would be:

SELECT CAST(date AS datetime) + CAST(time AS datetime) AS NewDT, variable, value
  FROM batch
 WHERE (CAST(date AS datetime) + CAST(time AS datetime) <= @BatchStartDate)