ADD VALUES IN PL/SQL?

My PL/SQL statement does not return the expected results.

below the variables A, B and C are declared as VARCHAR2 data type.

D is declared as a Number data type.

Select (to_number (A) + to_number (B) + (C) to_number IN double D;

I expect to have the sum of A, B and C

However, the value of D is always 0.

Help, please...

v_comprate: = to_number (v_comp1) + to_number (v_comp2) + to_number (v_comp3);

If v_comp1, v_comp2, v_comp3 one of the variable is null, then v_comprate will be null.

Why not use the NVL function.

v_comprate: = TO_NUMBER (NVL(v_comp1,'0')) + TO_NUMBER (NVL(v_comp2,0)) + TO_NUMBER (NVL(v_comp3,'0'));

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