How to write the pl/sql code for this scenario

Question

Hi,
Here is the data in a Table with below colums
id firstname lastname code
1 scott higgins 001
2 Mike Ferrari 001
3 Tom scottsdale 002
4 Nick pasquale 003
1 scott higgins 004
I want to trap the following exceptions into an error table using pl/sql
1. same person having multiple code
example
id first last Code
1 scott higgins 001
1 scott higgins 004
2. Multiple persons having same code
id first last Code
1 scott higgins 001
2 Mike Ferrari 001
Could you please help me how to capture the exceptions above using pl/sql
and what will be the structure of error table. it should capture eff date & end date

Answer 1

or using analytic functions like this:
select id, fname, lname, code from (
with t as(
    select 1 id, 'scott' fname, 'higgins' lname, 001 code from dual
    union all
    select 2 id,'Mike ' fname, 'Ferrari' lname,  001  code from dual
    union all
    select 3 id,'Tom' fname, 'scottsdale' lname, 002  code from dual
    union all
    select 4 id,'Nick' fname, 'pasquale' lname, 003  code from dual
    union all
    select 5 id,'scott' fname, 'higgins' lname, 004  code from dual
    select t.*, count(*) over (partition by fname) row_count from t)
where row_count > 1;
select id, fname, lname, code from (
with t as(
    select 1 id, 'scott' fname, 'higgins' lname, 001 code from dual
    union all
    select 2 id,'Mike ' fname, 'Ferrari' lname,  001  code from dual
    union all
    select 3 id,'Tom' fname, 'scottsdale' lname, 002  code from dual
    union all
    select 4 id,'Nick' fname, 'pasquale' lname, 003  code from dual
    union all
    select 5 id,'scott' fname, 'higgins' lname, 004  code from dual
    select t.*, count(*) over (partition by code) row_count from t)
where row_count > 1;