网上的一个SQL查询有关问题，很多人应该知道，请不吝赐教：
日期：2014-05-17 浏览次数：20919 次
网上的一个SQL查询问题，很多人应该知道，请不吝赐教：？
有一张表为emp_salary用于记录员工薪水，salary1—salary12分别存放员工12个月每月的工资，结构如下：
empno name Salary1 Salary2 Salary3 Salary4 Salary5 Salary6 Salary7 Salary8 Salary9 Salary10 Salary11 Salary12
但希望用以下表结构存放所有员工的薪水：
empno Name Month salary
请用一条sql语句实现以上要求:
------解决方案--------------------
比较简单的题了，自己东东脑子啊
------解决方案--------------------
行转列问题：
方法1：union all ,适用范围：8i,9i,10g及以后版本
有一张表为emp_salary用于记录员工薪水，salary1—salary12分别存放员工12个月每月的工资，结构如下：
empno name Salary1 Salary2 Salary3 Salary4 Salary5 Salary6 Salary7 Salary8 Salary9 Salary10 Salary11 Salary12
但希望用以下表结构存放所有员工的薪水：
empno Name Month salary
请用一条sql语句实现以上要求:
------解决方案--------------------
比较简单的题了，自己东东脑子啊
- SQL code
insert into newSalaryTable
(empno, name, salary, month)
select empno, name, salary, month
from (select empno, name, Salary1 salary, '1月' month
from salaryTable
union all
select empno, name, Salary2 salary, '2月' month
from salaryTable
union all
select empno, name, Salary3 salary, '3月' month
from salaryTable
union all
select empno, name, Salary4 salary, '4月' month
from salaryTable
union all
select empno, name, Salary5 salary, '5月' month
from salaryTable
union all
select empno, name, Salary6 salary, '6月' month
from salaryTable
union all
select empno, name, Salary7 salary, '7月' month
from salaryTable
union all
select empno, name, Salary8 salary, '8月' month
from salaryTable
union all
select empno, name, Salary9 salary, '9月' month
from salaryTable
union all
select empno, name, Salary10 salary, '10月' month
from salaryTable
union all
select empno, name, Salary11 salary, '11月' month
from salaryTable
union all
select empno, name, Salary12 salary, '12月' month from salaryTable);
------解决方案--------------------
行转列问题：
方法1：union all ,适用范围：8i,9i,10g及以后版本
- SQL code
SQL> WITH TEST AS(
2 SELECT 'A001' AS empno,'SUN' AS name ,100 Salary1,200 Salary2,300 Salary3,400 Salary4
3 ,500 Salary5,600 Salary6,700 Salary7,800 Salary8,900 Salary9,1000 Salary10,1100 Salary11,1200 Salary12
4 FROM DUAL UNION
5 SELECT 'A002','RAIN',1200,1100,1000,900,800,700,600,500,400,300,200,100 FROM DUAL
6 )
7 SELECT EMPNO,NAME,1 AS MONTH,SALARY1 AS SALARY FROM TEST
8 UNION ALL
9 SELECT EMPNO,NAME,2 AS MONTH,SALARY2 AS SALARY FROM TEST
10 UNION ALL
11 SELECT EMPNO,NAME,3 AS MONTH,SALARY3 AS SALARY FROM TEST
12 UNION ALL
13 SELECT EMPNO,NAME,4 AS MONTH,SALARY4 AS SALARY FROM TEST
14 UNION ALL
15 SELECT EMPNO,NAME,5 AS MONTH,SALARY5 AS SALARY FROM TEST
16 UNION ALL
17 SELECT EMPNO,NAME,6 AS MONTH,SALARY6 AS SALARY FROM TEST
18 UNION ALL
19 SELECT EMPNO,NAME,7 AS MONTH,SALARY7 AS SALARY FROM TEST
20 UNION ALL
21 SELECT EMPNO,NAME,8 AS MONTH,SALARY8 AS SALARY FROM TEST
22 UNION ALL
23 SELECT EMPNO,NAME,9 AS MONTH,SALARY9 AS SALARY FROM TEST
24 UNION ALL
25 SELECT EMPNO,NAME,10 AS MONTH,SALARY10 AS SALARY FROM TEST
26 UNION ALL
27 SELECT EMPNO,NAME,11 AS MONTH,SALARY11 AS SALARY FROM TEST
28 UNION ALL
29 SELECT EMPNO,NAME,12 AS MONTH,SALARY12 AS SALARY FROM TEST;
EMPNO NAME MONTH SALARY
----- ---- ---------- ----------
A001 SUN 1
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