Coalesce and case in left join

  I have a problem where I am creating a target column based on values of table T. In pseudo code this looks like:
If T.col1 = US , CAN then Local
Else coalesce(A.col1, B.col1)
Else null
from T left join A left join B on and

Can you please help me create a PROC SQL that accomplishes this?

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Aloysius LowCommented:
proc sql;
  create table X as
    select (case when T.col1 in ("US", "CAN") then "Local";
      when A.col1 = "" and B.col1 = "" then "";
      else coalesce(A.col1, B.col1);
      end) as Y
    from T left join A left join B on and

actually i'm not sure why you need to have an "else null" if A.col1 and B.col1 are blank, automatically you'll get a blank for the new field.

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