Bien sûr que non!
C'est Sundita!
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48 Connecté à : Oracle Database 10g Enterprise Edition Release 10.2.0.4.0 - 64bit Production With the Partitioning, OLAP, Data Mining and Real Application Testing options SQL> set linesize 132 SQL> create index hr.emp_hire_date on hr.employees(hire_date) / Index créé. SQL> set autotrace on SQL> Select employee_id, first_name, salary From ( Select employee_id, first_name, salary, hire_date from hr.employees order by hire_date desc ) where rownum = 1 / EMPLOYEE_ID FIRST_NAME SALARY ----------- -------------------- ---------- 173 Sundita 6100 Plan d'exécution ---------------------------------------------------------- Plan hash value: 3645119196 ----------------------------------------------------------------------------------------------- | Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time | ----------------------------------------------------------------------------------------------- | 0 | SELECT STATEMENT | | 1 | 38 | 2 (0)| 00:00:01 | |* 1 | COUNT STOPKEY | | | | | | | 2 | VIEW | | 1 | 38 | 2 (0)| 00:00:01 | | 3 | TABLE ACCESS BY INDEX ROWID| EMPLOYEES | 107 | 2461 | 2 (0)| 00:00:01 | | 4 | INDEX FULL SCAN DESCENDING| EMP_HIRE_DATE | 1 | | 1 (0)| 00:00:01 | ----------------------------------------------------------------------------------------------- Predicate Information (identified by operation id): --------------------------------------------------- 1 - filter(ROWNUM=1)
Non c'est Amit!
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39 Select --+ ALL_ROWS employee_id, first_name, salary From ( Select employee_id, first_name, salary, hire_date from hr.employees order by hire_date desc ) where rownum = 1 / EMPLOYEE_ID FIRST_NAME SALARY ----------- -------------------- ---------- 167 Amit 6200 Plan d'exécution ---------------------------------------------------------- Plan hash value: 3819624196 ------------------------------------------------------------------------------------- | Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time | ------------------------------------------------------------------------------------- | 0 | SELECT STATEMENT | | 1 | 38 | 4 (25)| 00:00:01 | |* 1 | COUNT STOPKEY | | | | | | | 2 | VIEW | | 107 | 4066 | 4 (25)| 00:00:01 | |* 3 | SORT ORDER BY STOPKEY| | 107 | 2461 | 4 (25)| 00:00:01 | | 4 | TABLE ACCESS FULL | EMPLOYEES | 107 | 2461 | 3 (0)| 00:00:01 | ------------------------------------------------------------------------------------- Predicate Information (identified by operation id): --------------------------------------------------- 1 - filter(ROWNUM=1) 3 - filter(ROWNUM=1)
Non c’est Sundita !
Non c’est Amit !
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