Question

I’m trying to do some work with my SQL table.

I have 2 buildings with room numbers 1 – 100 in building 1 and 101 – 199 in building 2.
I have a location field (which I’ve just created) and want to run a query to populate it with either ‘Building 1’ or ‘Building 2’ depending on which room number it has in the ‘Room’ field.

Many thanks for your help.

Regards

Scott

Answer 1

You can use Case to update your table:

Update your_table
Set location = Case When room_number <= 100 Then
                       'Building 1'
                    Else
                       'Building 2'
                    End;

If all of your room-numbers have three digits followed by some other characters, using substring should work:

Case When Cast( Substring( room_number, 1, 3 ) As Int ) <= 100 Then

Since not all of your rooms start with three digits (1A) you can use PatIndex to find the length of the number:

Case When
   Cast(
      Substring( room_number, 1, PatIndex( '%[A-Z]%', room_number || 'A' ) - 1 )
   As Int ) <= 100
Then

I’m concatenating the A to make sure it also works with numerical room-numbers.