本系列文章導(dǎo)航
[Oracle]高效的PL/SQL程序設(shè)計(jì)(一)--偽列ROWNUM使用技巧
[Oracle]高效的PL/SQL程序設(shè)計(jì)(二)--標(biāo)量子查詢
[Oracle]高效的PL/SQL程序設(shè)計(jì)(三)--Package的優(yōu)點(diǎn)
[Oracle]高效的PL/SQL程序設(shè)計(jì)(四)--批量處理
[Oracle]高效的PL/SQL程序設(shè)計(jì)(五)--調(diào)用存儲(chǔ)過(guò)程返回結(jié)果集
[Oracle]高效的PL/SQL程序設(shè)計(jì)(六)--%ROWTYPE的使用
select
*
from
hr.employees
where
rownum
<=
10
select
rownum,t.
*
from
(
select
rownum,employees.
*
from
hr.employees
order
by
first_name)t
where
rownum
<=
10
SELECTSTATEMENT,GOAL=CHOOSECost=5Cardinality=10Bytes=15622
COUNTSTOPKEY
VIEWObjectowner=SCOTTCost=5Cardinality=107Bytes=15622
SORTORDERBYSTOPKEYCost=5Cardinality=107Bytes=7276
COUNT
TABLEACCESSFULLObjectowner=HRObjectname=EMPLOYEESCost=2Cardinality=107Bytes=7276
ROWNUMROWNUMEMPLOYEE_IDFIRST_NAMELAST_NAMEEMAIL
122121AdamFrippAFRIPP
297196AlanaWalshAWALSH
348147AlbertoErrazurizAERRAZUR
44103AlexanderHunoldAHUNOLD
516115AlexanderKhooAKHOO
686185AlexisBullABULL
759158AllanMcEwenAMCEWEN
876175AlyssaHuttonAHUTTON
968167AmitBandaABANDA
1088187AnthonyCabrioACABRIO
SELECTSTATEMENT,GOAL=CHOOSECost=2Cardinality=20Bytes=2920
VIEWObjectowner=SCOTTCost=2Cardinality=20Bytes=2920
COUNTSTOPKEY
TABLEACCESSFULLObjectowner=HRObjectname=EMPLOYEESCost=2Cardinality=107Bytes=7276
select
t.
*
from
(
select
rownumrnum,employees.
*
from
hr.employees)t
where
rnum
between
11
and
20
SELECTSTATEMENT,GOAL=CHOOSECost=2Cardinality=107Bytes=15622
VIEWObjectowner=SCOTTCost=2Cardinality=107Bytes=15622
COUNT
TABLEACCESSFULLObjectowner=HRObjectname=EMPLOYEESCost=2Cardinality=107Bytes=7276
select
*
from
(
select
employees.
*
from
hr.employees
)emp,
(
select
departments.
*
from
hr.departments
)dept
where
emp.department_id
=
dept.department_id
SELECTSTATEMENT,GOAL=CHOOSECost=5Cardinality=106Bytes=9328
HASHJOINCost=5Cardinality=106Bytes=9328
TABLEACCESSFULLObjectowner=HRObjectname=DEPARTMENTSCost=2Cardinality=27Bytes=540
TABLEACCESSFULLObjectowner=HRObjectname=EMPLOYEESCost=2Cardinality=107Bytes=7276
select
*
from
(
select
employees.
*
,rownum
from
hr.employees
)emp,
(
select
departments.
*
,rownum
from
hr.departments
)dept
where
emp.department_id
=
dept.department_id
SELECTSTATEMENT,GOAL=CHOOSECost=5Cardinality=106Bytes=22790
HASHJOINCost=5Cardinality=106Bytes=22790
VIEWObjectowner=TESTCost=2Cardinality=27Bytes=1863
COUNT
TABLEACCESSFULLObjectowner=HRObjectname=DEPARTMENTSCost=2Cardinality=27Bytes=540
VIEWObjectowner=TESTCost=2Cardinality=107Bytes=15622
COUNT
TABLEACCESSFULLObjectowner=HRObjectname=EMPLOYEESCost=2Cardinality=107Bytes=7276
博文來(lái)源： http://blog.csdn.net/huanghui22/archive/2007/03/20/1535688.aspx
更多文章、技術(shù)交流、商務(wù)合作、聯(lián)系博主
微信掃碼或搜索：z360901061
微信掃一掃加我為好友
QQ號(hào)聯(lián)系： 360901061
您的支持是博主寫(xiě)作最大的動(dòng)力，如果您喜歡我的文章，感覺(jué)我的文章對(duì)您有幫助，請(qǐng)用微信掃描下面二維碼支持博主2元、5元、10元、20元等您想捐的金額吧，狠狠點(diǎn)擊下面給點(diǎn)支持吧，站長(zhǎng)非常感激您！手機(jī)微信長(zhǎng)按不能支付解決辦法：請(qǐng)將微信支付二維碼保存到相冊(cè)，切換到微信，然后點(diǎn)擊微信右上角掃一掃功能，選擇支付二維碼完成支付。
【本文對(duì)您有幫助就好】元
