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--- kurs:correlated_subquery [2009/09/24 16:12]
mh
+++ kurs:correlated_subquery [2014/09/10 21:22]
127.0.0.1 external edit
@@ Line 1: / Line 1: @@
+<code>
+select first_name, last_name, e.employee_id, c from employees e,
+(select employee_id, count(employee_id) c from job_history
+group by employee_id
+having count(employee_id) >= 2) g
+where e.employee_id = g.employee_id
+select first_name, last_name, employee_id from employees e
+where (select count(*) from job_history where employee_id = e.employee_id) >= 2
+select  first_name, last_name from employees e where
+-- employee_id in (select manager_id from employees where e.employee_id = manager_id)
+exists (select 1 from employees where e.employee_id = manager_id)
+</code>
+<code>
+select first_name, last_name, e.employee_id, c from employees e,
+(select employee_id, count(employee_id) c from job_history
+group by employee_id
+having count(employee_id) >= 2) g
+where e.employee_id = g.employee_id
+select first_name, last_name, employee_id from employees e
+where (select count(*) from job_history where employee_id = e.employee_id) >= 2
+</code>
+<code>
+select * from (
+SELECT tst_fahrzeuge.fhz_name, count(tst_extras.ext_name) c
+  FROM tst_extras, tst_fahrzeuge, tst_fhz_ext_int
+ WHERE (    (tst_extras.ext_id = tst_fhz_ext_int.fei_ext_id)
+        AND (tst_fahrzeuge.fhz_id = tst_fhz_ext_int.fei_fhz_id)
+       )
+group by fhz_name
+) where c > 1
+select fhz_name from tst_fahrzeuge outer
+where (
+SELECT count(ext_name) c
+  FROM tst_extras, tst_fahrzeuge inner, tst_fhz_ext_int
+ WHERE (    (ext_id = fei_ext_id)
+        AND (inner.fhz_id = fei_fhz_id)
+        and  outer.fhz_name = inner.fhz_name
+       )) > 1
+</code>

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