have seen how to create macro variables during DATA step execution.
You can also create or update macro variables during the execution
of a PROC SQL step. Remember that the SELECT statement in a PROC SQL
step retrieves and displays data. The INTO clause in a SELECT statement
enables you to create or update macro variables.
When you create or update macro variables
during execution of a PROC SQL step, you might not want any output
to be displayed. The PRINT | NOPPRINT option specifies whether a SELECT
statement's results are displayed in output. PRINT is the default
General form, PROC SQL with the NOPRINT option and the INTO clause: ...