sql - PLSQL SELECT INTO FROM parameter -

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i created function should return max id table(parameter)

create or replace function getmaxid ( p_table in varchar2 ) return number v_maxid number(38);  begin  select max(id) v_maxid p_table;  return v_maxid;  end getmaxid

however, keep getting error message "ora-00942: table or view not exist" on line:

select max(id) v_maxid p_table;

like explained earlier, need use dynamic sql perform operation. in case, p_table variable. solution build string contain sql , dynamically execute 1 you've build query.

the example below uses, dual, table name arbitrary.

here you're looking for, take function outside of block, left can test it.. 

declare    function getmaxid (p_table in varchar2)       return number          v_maxid    number (38);       v_select   varchar2 (200);       cnt        sys_refcursor;    begin       v_select := 'select count(*) ' || p_table;        dbms_output.put_line (v_select);        execute immediate v_select v_maxid;        return v_maxid;    end getmaxid; begin    dbms_output.put_line (getmaxid ('dual')); end;

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