The following words are reserved in PROC SQL: The keyword CASE is always reserved; its use in the CASE expression (an SQL2 feature) precludes its use as a column name. If you have a column named CASE ...

Some DBMSs allow case sensitive column and table names as well as names ... are used with SAS/ACCESS and the SQL Procedure Pass-Through Facility. See your DBMS chapter for more information about the ...