LIBNAME demolib "c:\temp\demolib";

PROC SQL;
CREATE TABLE demolib.fifteenups AS
SELECT name AS FName, sex, age, height, weight
FROM sashelp.class
WHERE age GE 15
;
QUIT;

DATA demolib.fifteenups;
fname = "Adam" ;
sex = "M" ;
age = 15 ;
height = 68 ;
weight = 130 ;
OUTPUT;
fname = "Joan" ;
sex = "F" ;
age = 16 ;
height = 64 ;
weight = 120 ;
OUTPUT;
STOP;
MODIFY demolib.fifteenups;
RUN;

rt,这是Proc SQL by example这本书上的代码，我想问下倒数第三行的STOP的目的是什么？ 为什么不加STOP就会出错？求大神解释