select id, week_end_date, exam_completed_date,
max(exam_completed_date) over (partition by id order by week_end_date) as newcolumn
from emp_table emp left outer join
exam_table exam
on exam.id=emp.id and
exam.exam_completed_date = emp.week_end_date
where id = 0;
使用左外部联接联接两个表，并根据右表列填充新的列值
使用左外部联接联接两个表，并根据右表列填充新的列值
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