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select max(case when mod(lvl, 2) = 0 then periods end) start_date, max(case when mod(lvl, 2) = 1 then periods end) end_date from ( select regexp_substr ('|2020/04/26|2020/05/02|2020/05/03|2020/05/10', '[^|]+', 1, level) as periods, level - 1 as lvl from dual connect by level <= length (regexp_replace('|2020/04/26|2020/05/02|2020/05/03|2020/05/10', '[^|]+')) ) t group by trunc(lvl / 2)
START_DATE
END_DATE
2020/04/26
2020/05/02
2020/05/03
2020/05/10