SQL case 语句，使用 IF、THEN DO 将此 SAS 代码转换为 SQL 脚本

Question

I need to do this for work as we are transforming some of our SAS programs into SQL as part of an ongoing project. This is the SAS code that I need to change into SQL case statement:

if Patients1 in (08,09,10) or (Patients1=41 and HospAttend=' Yes') then do;
        if Patients2 ne 23 then AdmitResult='1. Patient Type A';
        else if Patients2 =23 then AdmitResult='2. Patient Type B';
    end;

Any help is greatly appreciated!

Answer 1

As a case expression this would be:

(case when Patients1 in ('08', '09', '10') or
           (Patients1 = '41' and HospAttend = ' Yes') 
      then (case when Patients2 <> 23 then '1. Patient Type A';
                 else '2. Patient Type B'
            end)
 end) as AdmitResult;

Note: The leading zeros on Patients1 suggest that the values are strings. If they are numbers, remove both the single quotes and the leading zeros (the leading zeros are misleading in that case).

Also, the space in ' Yes' is meaningful and you might not really need it. Strings are not usually stored with leading spaces.