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emp_data as (
select 1 emp_id, 'x,y,z' emp_loc from dual
select 1 emp_id, 'm,y,z' emp_loc from dual
emp_split as (
select emp_id, regexp_substr(emp_loc, '[^,]+', 1, level) loc
connect by regexp_substr(emp_loc, '[^,]+', 1, level) is not null)
select distinct emp_id, loc from emp_split;
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