kurs:rownum
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| Both sides previous revision Previous revision Next revision | Previous revision | ||
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kurs:rownum [2011/05/31 14:18] mh |
kurs:rownum [2015/10/27 09:42] (current) mh |
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| + | Verschachtelte with-clause zum "Nachbauen" von limit | ||
| + | |||
| + | <code> | ||
| + | with | ||
| + | emp_sal_sort as ( | ||
| + | select first_name, | ||
| + | last_name, | ||
| + | salary | ||
| + | from employees | ||
| + | order by salary desc | ||
| + | ), | ||
| + | emp_sal_sort_rn as ( | ||
| + | select rownum rn, emp_sal_sort.* from emp_sal_sort | ||
| + | ) | ||
| + | select * from emp_sal_sort_rn | ||
| + | where rn > 10 and rn <= 20 | ||
| + | </code> | ||
| + | |||
| + | |||
| <code> | <code> | ||
| select first_name, last_name, salary from employees where | select first_name, last_name, salary from employees where | ||
| Line 13: | Line 32: | ||
| select rownum rn, first_name, last_name, salary from employees ) | select rownum rn, first_name, last_name, salary from employees ) | ||
| where rn > 5 | where rn > 5 | ||
| + | </code> | ||
| + | |||
| + | <code> | ||
| + | select * from ( | ||
| + | select rownum r, | ||
| + | first_name, | ||
| + | last_name, | ||
| + | salary | ||
| + | from ( | ||
| + | select first_name, | ||
| + | last_name, | ||
| + | salary | ||
| + | from employees | ||
| + | order by salary desc | ||
| + | ) | ||
| + | ) where r > 5 | ||
| </code> | </code> | ||
kurs/rownum.1306844327.txt.gz ยท Last modified: 2014/09/10 21:22 (external edit)
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