The DISCONNECT statement
ends the connection with the DBMS. If you do not include the DISCONNECT
statement, SAS performs an implicit DISCONNECT when PROC SQL terminates.
The SQL procedure continues to execute until you submit a QUIT statement,
another SAS procedure, or a DATA step.
Any return code or message
that is generated by the DBMS is available in the macro variables
SQLXRC and SQLXMSG after the statement executes.
See Macro Variables for Relational Databases for more information
about these macro variables.