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declare
n number(10);
tsql varchar2(100);
begin
select test_seq.nextval into n from dual;
n:=-(n-1);
tsql:='alter sequence test_seq increment by'|| n;
execute immediate tsql;
select test_seq.nextval into n from dual;
tsql:='alter sequence test_seq increment by 1';
execute immediate tsql;
end;
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