proc sql; title 'Left Outer Join'; select * from lefttab as l left join righttab as r on l.continent=r.continent; A right outer join, specified with the keywords RIGHT JOIN and ON, has all the rows ...

You can also surround CASE in double quotes ("CASE") and set the PROC SQL option DQUOTE=ANSI. The keywords AS, ON, FULL, JOIN, LEFT, FROM, WHEN, WHERE, ORDER, GROUP, RIGHT, INNER, OUTER, UNION, EXCEPT ...