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kurs:correlated_subquery

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kurs:correlated_subquery [2020/06/02 09:26]
admin
kurs:correlated_subquery [2022/03/15 10:39] (current)
admin
Line 1: Line 1:
 +<​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,
kurs/correlated_subquery.txt ยท Last modified: 2022/03/15 10:39 by admin