sql

 

select * from (
SELECT empid,salary, row_number() OVER (partition by deptid ORDER BY salary desc) rank  FROM employee
)
where rank =1

　

create table employee (empid int ,deptid int ,salary decimal(10,2))
insert into employee values(1,10,5500.00)
insert into employee values(2,10,4500.00)
insert into employee values(3,20,1900.00)
insert into employee values(4,20,4800.00)
insert into employee values(5,40,6500.00)
insert into employee values(6,40,14500.00)
insert into employee values(7,40,44500.00)
insert into employee values(8,50,6500.00)
insert into employee values(9,50,7500.00)

　　

談談Oracle關於row_number()分析函數用法

dataguard手動switchover切換步驟及注意的問題

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