run ? quit ?

[tianerhu]

Finally, the query ends with a QUIT statement. You do not need a
RUN statement because PROC SQL executes as soon as a complete query has been
specified. If you don’t include a QUIT statement, PROC SQL remains in memory for
another query.

Above is from my textbook,  I cannot understand.

[PaigeMiller]

PROC SQL should always end with QUIT;

It should never end with RUN;

[Kurt_Bremser · Accepted solution]

PROC SQL is "interactive". Each statement is executed immediately when completed, so no RUN; is needed. To end the procedure, a QUIT; is the correct way. But the SAS interpreter will also terminate the SQL procedure if a DATA or PROC statement is encountered.

Other procedures that are not ended by a RUN are those that support run-group processing, like PROC DATASETS; these also need a QUIT.

[tianerhu]

Thank you for your help.