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--- kurs:sets_gruppenoperatoren [2008/10/23 12:25]
127.0.0.1 external edit
+++ kurs:sets_gruppenoperatoren [2010/05/18 11:15]
127.0.0.1 external edit
@@ Line 1: / Line 1: @@
+<code>
+select employee_id as id, job_id, last_name, to_date(sysdate) from employees
+union
+select employee_id, job_id, to_char(null), to_date(end_date) from job_history
+order by 1,3,4 desc
+</code>
+<code>
+select first_name, last_name from employees where employee_id in
+(
+  select employee_id
+  from employees
+  where job_id = 'IT_PROG'
+ union
+  select employee_id
+  from job_history
+  where job_id = 'IT_PROG'
+)
+------
+select first_name, last_name, stand, datum from employees,
+(
+  select employee_id,
+         job_id,
+         'jetzt' stand,
+         sysdate datum
+  from employees
+  where job_id = 'IT_PROG'
+ union
+  select employee_id,
+         job_id,
+         'früher' stand,
+         end_date datum
+  from job_history
+  where job_id = 'IT_PROG'
+) history
+where history.employee_id = employees.employee_id
+</code>

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