Error in Parameters of Stored Procedure when Dynamic SQL is used -

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i using oracle sql developer write stored proc, accepts list of values separated "," (dynamic sql) , use variable in "in" clause fire query table.

but ending error @ 

@p_case_nbr       varchar2(100),

error(4,5): pls-00103: encountered symbol "@" when expecting 1 of following: current delete exists prior

the sp used:

    create or replace procedure test_proc (        @p_case_nbr       varchar2(100),     p_out_case_nbr    out varchar2  )   cursor test_cur       select t.column1       test_table t       t.column1 in (@p_case_nbr);        test_cur_line  test_cur%rowtype; begin  p_out_case_nbr := null;    open test_cur;     loop       fetch test_cur test_cur_line;       exit when test_cur%notfound;        p_out_case_nbr := p_out_case_nbr || ' ' || test_cur_line.column1;       dbms_output.put_line(test_cur_line.column1);     end loop;   close test_cur;     dbms_output.put_line('final value ' || p_out_case_nbr);   dbms_output.put_line('sp completed succesfully'); end;

in oracle no need of giving @ before varibles try remove @ @p_case_nbr ever specified , try once again , no need of specifying size of parameter @p_case_nbr varchar2(100) give @p_case_nbr varchar


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