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[Oracle]高效的PL/SQL程序設(shè)計(一)--偽列ROWNUM使用技巧
[Oracle]高效的PL/SQL程序設(shè)計(二)--標(biāo)量子查詢
[Oracle]高效的PL/SQL程序設(shè)計(三)--Package的優(yōu)點
[Oracle]高效的PL/SQL程序設(shè)計(四)--批量處理
[Oracle]高效的PL/SQL程序設(shè)計(五)--調(diào)用存儲過程返回結(jié)果集
[Oracle]高效的PL/SQL程序設(shè)計(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
博文來源： http://blog.csdn.net/huanghui22/archive/2007/03/20/1535688.aspx
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