my question is that how to use revoke and grant in sql commands
SQL> select * from student2;
NAME ROLLNO CLASS
-------------------- ---------- ----------
satish 1 10
suresh 2 10
srikanth 3 10
SQL> grant select on student2 to satish;
grant select on student2 to satish
*
ERROR at line 1:
ORA-01917: user or role 'SATISH' does not exist
SQL> revoke update on student2 from satish;
revoke update on student2 from satish
*
ERROR at line 1:
ORA-01917: user or role 'SATISH' does not exist
above r the commands i used regarding revoke and grant,but i got errors,can any body help me.