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Compare two different tables

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Hello
I am working on a Application in Oracle Apex 4.2

i want to compare two tables with the same collums but with different Data and count the differences.
I am using test environment of Scott Tiger.

i got this code and it works fine, especially when there is a ORDER BY in the select statement.
any ideas how to fix this?

pls help me ! (:

Code:

CREATE OR REPLACE FUNCTION checkSQL (fragenID IN NUMBER, v_statement IN VARCHAR)

RETURN NUMBER IS

  v_frage VARCHAR(1000);

  v_ID NUMBER(4);
  v_Statement VARCHAR(1000);
  v_erg NUMBER(2);
       

BEGIN
  v_ID := fragenID;

  SELECT FRAGE into v_frage
  FROM tb_frage
  WHERE v_id = v_ID;


EXECUTE IMMEDIATE('SELECT COUNT(*) FROM ('||v_frage||' MINUS '||v_statement||')') INTO v_erg;


RETURN v_erg;
END;


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