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kurs:employees_per_year [2011/11/09 15:38] mh |
kurs:employees_per_year [2016/12/01 13:53] (current) admin |
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<code> | <code> | ||
- | with list_years as ( | + | with list_year as ( |
- | select level-1 + 1985 as ya from dual connect by level<20 | + | select level-1 + |
+ | (select extract(year from min(hire_date)) from emp) | ||
+ | as yl from dual connect by level <= | ||
+ | (select extract(year from max(hire_date)) - | ||
+ | extract(year from min(hire_date)) + 1 | ||
+ | from emp) | ||
) | ) | ||
- | select ya, count(hire_date) from employees right join list_years | + | select yl, count(employee_id) from emp right join |
- | on ya = (extract(year from hire_date)) | + | list_year on yl = extract(year from hire_date) |
- | group by ya | + | group by yl |
- | order by ya | + | order by yl |
</code> | </code> |