SQL> select * from employees d, departments t where d.department_id=t.department_id; 106 rows selected. Execution Plan ---------------------------------------------------------- Plan hash value: 1343509718 -------------------------------------------------------------------------------- ------------ | Id | Operation | Name | Rows | Bytes | Cost (%CPU) | Time | -------------------------------------------------------------------------------- ------------ | 0 | SELECT STATEMENT | | 106 | 9540 | 6 (17) | 00:00:01 | | 1 | MERGE JOIN | | 106 | 9540 | 6 (17) | 00:00:01 | | 2 | TABLE ACCESS BY INDEX ROWID| DEPARTMENTS | 27 | 567 | 2 (0) | 00:00:01 | | 3 | INDEX FULL SCAN | DEPT_ID_PK | 27 | | 1 (0) | 00:00:01 | |* 4 | SORT JOIN | | 107 | 7383 | 4 (25) | 00:00:01 | | 5 | TABLE ACCESS FULL | EMPLOYEES | 107 | 7383 | 3 (0) | 00:00:01 | -------------------------------------------------------------------------------- ------------ Predicate Information (identified by operation id): --------------------------------------------------- 4 - access("D"."DEPARTMENT_ID"="T"."DEPARTMENT_ID") filter("D"."DEPARTMENT_ID"="T"."DEPARTMENT_ID") Statistics ---------------------------------------------------------- 8 recursive calls 0 db block gets 20 consistent gets 0 physical reads
时间: 2024-12-22 07:23:03