Question

I have the following SQL statement:

 update data 
  set [sub_st_pc]= 
    case 
          when [R 6] is not null  then [R 6] 
      when [R 5] is not null  then [R 5]
      when [R 4] is not null  then [R 4]
      when [R 3] is not null  then [R 3]
      when [R 2] is not null  then [R 2]
      else sub_st_pc
    end

but I need to update another column according to each when, something like this:

 when [R 6] is not null  then [R 6], [temp] = 6
 when [R 5] is not null  then [R 5], [temp] = 5

which I know it’s wrong.

Any ideas?

Answer 1

You can use COALESCE to make setting the first column easier. You’ll need a separate CASE statement to set [temp], and COALESCE won’t help you there.

update data 
set [sub_st_pc]= COALESCE([R 6], [R 5], [R 4], [R 3], [R 2], [sub_st_pc]),
    [temp] = case 
               when [R 6] is not null  then 6 
               when [R 5] is not null  then 5
               when [R 4] is not null  then 4
               when [R 3] is not null  then 3
               when [R 2] is not null  then 2
               else NULL
             end