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kurs:correlated_subquery [2020/06/02 09:26] admin |
kurs:correlated_subquery [2022/03/15 10:39] (current) admin |
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+ | <code> | ||
+ | with cte_multiple_last_names as ( | ||
+ | select last_name, | ||
+ | count(*) c | ||
+ | from hr.employees | ||
+ | group by last_name | ||
+ | having count(*) > 1 | ||
+ | order by c desc | ||
+ | ) | ||
+ | select employee_id, | ||
+ | first_name, | ||
+ | last_name | ||
+ | from hr.employees where last_name | ||
+ | in (select last_name from cte_multiple_last_names) | ||
+ | |||
+ | |||
+ | select | ||
+ | emp.first_name, | ||
+ | emp.last_name | ||
+ | from | ||
+ | hr.employees emp | ||
+ | where | ||
+ | (select count(last_name) from hr.employees emp_sub where emp_sub.last_name = emp.last_name) > 1 | ||
+ | |||
<code> | <code> | ||
select first_name, last_name, e.employee_id, c from employees e, | select first_name, last_name, e.employee_id, c from employees e, |