Oracle SQL找到5个最低薪水 [英] Oracle SQL Finding the 5 lowest salaries
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问题描述
我正在尝试回答以下问题.显示ID_Number和五个最低薪水雇员的姓名.
I am trying to answer the following question. Show ID_Number and name for the five lowest paid employees.
这是员工表:
CREATE TABLE Employees
(ID_No CHAR(4) NOT NULL,
Name VARCHAR(50) NOT NULL,
Hire_Date DATE NOT NULL,
Position VARCHAR(20) CHECK(Position IN('CHAIRMAN','MANAGER','ANALYST','DESIGNER','PROGRAMMER','SALES REP','ADMIN','ACCOUNTANT')),
Salary NUMERIC(8,2) NOT NULL,
Mgr_ID_No CHAR(4) NULL,
Dept_No SMALLINT NULL);
我要补充一点,我一直在尝试一些方法,由于某些原因,"limit"和"top"无效.
I will add that I've been trying a few methods and "limit" and "top" do not work for some reason.
推荐答案
在 Oracle 12c 中:
-- more than 5 rows being returned, if multiple rows
-- match the value of the 5th row
SELECT e.ID_No, e.Name
FROM Employees e
ORDER BY e.Salary
FETCH FIRST 5 ROWS WITH TIES;
-- only 5 rows being returned, even if multiple rows
-- match the value of the 5th row
SELECT e.ID_No, e.Name
FROM Employees e
ORDER BY e.Salary
FETCH FIRST 5 ROWS ONLY;
-- NEXT clause may be replaced with FIRST
SELECT e.ID_No, e.Name
FROM Employees e
ORDER BY e.Salary
FETCH NEXT 5 ROWS ONLY;
Oracle 12c 之前的版本:
SELECT e.ID_No, e.Name
FROM ( SELECT ID_No, Name, row_number() over (order by salary) seq FROM Employees ) e
WHERE e.seq <= 5
ORDER BY e.seq;
查询可用于 前N个查询
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