1.old sql:
創(chuàng)新互聯(lián)建站主打移動網(wǎng)站、做網(wǎng)站、網(wǎng)站設(shè)計、網(wǎng)站改版、網(wǎng)絡(luò)推廣、網(wǎng)站維護(hù)、國際域名空間、等互聯(lián)網(wǎng)信息服務(wù),為各行業(yè)提供服務(wù)。在技術(shù)實力的保障下,我們?yōu)榭蛻舫兄Z穩(wěn)定,放心的服務(wù),根據(jù)網(wǎng)站的內(nèi)容與功能再決定采用什么樣的設(shè)計。最后,要實現(xiàn)符合網(wǎng)站需求的內(nèi)容、功能與設(shè)計,我們還會規(guī)劃穩(wěn)定安全的技術(shù)方案做保障。
SELECT a.object_id, a.object_name, b.max_id, b.min_id FROM HH a, ( SELECT owner, MAX (object_id) AS max_id, MIN (object_id) AS min_id FROM HH GROUP BY owner) b WHERE a.last_ddl_time BETWEEN TO_DATE ('2010-01-01', 'yyyy-mm-dd') AND TO_DATE ('2012-01-01', 'yyyy-mm-dd') AND a.owner IN ('MESDEV', 'RPTDEV') and a.owner=b.owner;
Elapsed: 00:00:25.50 Execution Plan ---------------------------------------------------------- ----------------------------------------------------------------- | Id | Operation | Name | Rows | Bytes | Cost (%CPU)| ----------------------------------------------------------------- | 0 | SELECT STATEMENT | | 2 | 254 | 433 (2)| | 1 | HASH GROUP BY | | 2 | 254 | 433 (2)| | 2 | HASH JOIN | | 2 | 254 | 432 (1)| | 3 | TABLE ACCESS FULL| HH | 2 | 194 | 216 (1)| | 4 | TABLE ACCESS FULL| HH | 661 | 19830 | 216 (1)| ----------------------------------------------------------------- Note ----- - 'PLAN_TABLE' is old version Statistics ---------------------------------------------------------- 1 recursive calls 0 db block gets 1904 consistent gets 0 physical reads 0 redo size 111609 bytes sent via SQL*Net to client 2670 bytes received via SQL*Net from client 200 SQL*Net roundtrips to/from client 0 sorts (memory) 0 sorts (disk) 2977 rows processed
2.new sql
SELECT a.object_id, a.object_name, a.max_id, a.min_id FROM (SELECT object_id, object_name, last_ddl_time, MAX (object_id) OVER (PARTITION BY owner) AS max_id, MIN (object_id) OVER (PARTITION BY owner) AS min_id FROM HH WHERE owner IN ('MESDEV', 'RPTDEV')) a WHERE a.last_ddl_time BETWEEN TO_DATE ('2010-01-01', 'yyyy-mm-dd') AND TO_DATE ('2012-01-01', 'yyyy-mm-dd');
Elapsed: 00:00:00.09 Execution Plan ---------------------------------------------------------- ----------------------------------------------------------------- | Id | Operation | Name | Rows | Bytes | Cost (%CPU)| ----------------------------------------------------------------- | 0 | SELECT STATEMENT | | 661 | 75354 | 217 (2)| | 1 | VIEW | | 661 | 75354 | 217 (2)| | 2 | WINDOW SORT | | 661 | 64117 | 217 (2)| | 3 | TABLE ACCESS FULL| HH | 661 | 64117 | 216 (1)| ----------------------------------------------------------------- Note ----- - 'PLAN_TABLE' is old version Statistics ---------------------------------------------------------- 1 recursive calls 0 db block gets 952 consistent gets 0 physical reads 0 redo size 108149 bytes sent via SQL*Net to client 2670 bytes received via SQL*Net from client 200 SQL*Net roundtrips to/from client 1 sorts (memory) 0 sorts (disk) 2977 rows processed