SQl%rowcount problem

Question

i have created a function, in pl/sql to check the diffrence betwenn 2 similar tables having same columns . if it has diffrence tha is if select query returns row then it shoul go in error log table but this is not happening could you solve my problem.
thanks in advance
CREATE OR REPLACE FUNCTION CAL_BETWEEN_TABLES(
source_name IN VARCHAR2,
target_name IN VARCHAR2)
RETURN number
IS
v_success CONSTANT NUMBER := 0;
v_failure CONSTANT NUMBER := -1;
V_SQL VARCHAR2(10000);
v_rows_processed NUMBER :=0;
p_err_modul error_logs.err_modul%TYPE := 'NULL';
p_err_function error_logs.err_function%TYPE := ' CAL_BETWEEN_TABLES';
p_err_type error_logs.err_type%TYPE := 'SN';
BEGIN
V_SQL:= 'SELECT * from '||source_name||' minus select * from '||target_name||'';
v_rows_processed:=sql%rowcount;
IF v_rows_processed>0
THEN
     p_err.insert_error(p_err_modul,
p_err_function,
p_err_type,
SQLCODE,
USER,
'Failed in the function CAL_BETWEEN_TABLES' ||
SQLERRM);
RETURN(v_failure);
--dbms_output.put_line('failure');
ELSE
RETURN(v_success);
--dbms_output.put_line('success');
END IF;
END CAL_BETWEEN_TABLES;

Answer 1

You are missing EXECUTE IMMEDIATE or it is cut and paste problem. also
Declare variable
v_row source_name%rowtype;
V_SQL:= 'SELECT * from '||source_name||' minus select * from '||target_name||'';
EXECUTE IMMEDIATE v_sql INTO v_row;
v_rows_processed:=sql%rowcount;
HTH