一个简单的PL/SQL程序

DECLARE
u NUMBER;
BEGIN
SELECT user# INTO u FROM sys.user$ WHERE name='DEMO' AND type#=1;
DBMS_OUTPUT.PUT_LINE(u);
SELECT user# INTO u FROM sys.user$ WHERE name='DEMO2' AND type#=1;
DBMS_OUTPUT.PUT_LINE(u);
SELECT 1 INTO u FROM sys.obj$ WHERE name='TEST1' AND type#=2 AND owner#=u;
DBMS_OUTPUT.PUT_LINE(u);
END;