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increment by 1
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update emp1
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comm = nvl(comm,0) + 50
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conn / as sysdba;
create user t1 identified by t1;
create user t2 identified by t2;
grant connect to t1,t2;
grant create table, create view to t1 with admin option;
conn t1/t1
grant create table to t2;
conn / as sysdba;
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