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over£¨order by salary£© °´ÕÕsalaryÅÅÐò½øÐÐÀۼƣ¬order
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SELECT manager_id, last_name, hire_date, salary,
AVG(salary)
OVER (PARTITION BY manager_id ORDER BY hire_date
ROWS BETWEEN 1
PRECEDING AND 1 FOLLOWING) AS c_mavg
from employees;
MANAGER_ID LAST_NAME HIRE_DATE SALARY C_MAVG
----------
------------------------- --------- ---------- ----------
100 Kochhar
21-SEP-89 17000 17000
100 De Haan 13-JAN-93 17000 15000
100
Raphaely 07-DEC-94 11000 11966.6667
100 Kaufling 01-MAY-95 7900
10633.3333
100 Hart


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select * from  a , b 
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create temporary tablespace zfmi_temp
tempfile 'D:\oracle\oradata\zfmi\zfmi_temp.dbf'
size 32m
autoextend on
next 32m maxsize 2048m
extent management local;
//tempfile²ÎÊý±ØÐëÓÐ
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create table ......

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