SAS/ACCESS 9.2 for Relational Databases: Reference, Fourth Edition

SAS/ACCESS Interface to ODBC 4 Using DBSLICE= 667Nullable ColumnsIf you select a nullable column for autopartitioning, the ORIS NULLSQL statement is appended at the end of the SQL code that is generated for thethreaded read. This ensures that any possible NULL values are returned in the resultset. Also, if the column to be used for the partitioning is SQL_BIT, the number ofthreads are automatically changed to two, regardless of how the DBSLICEPARM=option is set.Using WHERE ClausesAutopartitioning does not select a column to be the partitioning column if it appearsin the WHERE clause. For example, the following DATA step could not use a threadedread to retrieve the data because all numeric columns in the table are in the WHEREclause:data work.locemp;set trlib.MYEMPS;where EMPNUM