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 100A002 RAIN 1 1200A001 SUN 2 200A002 RAIN 2 1100A001 SUN 3 300A002 RAIN 3 1000A001 SUN 4 400A002 RAIN 4 900A001 SUN 5 500A002 RAIN 5 800A001 SUN 6 600A002 RAIN 6 700A001 SUN 7 700A002 RAIN 7 600A001 SUN 8 800A002 RAIN 8 500A001 SUN 9 900A002 RAIN 9 400A001 SUN 10 1000A002 RAIN 10 300 EMPNO NAME MONTH SALARY----- ---- ---------- ----------A001 SUN 11 1100A002 RAIN 11 200A001 SUN 12 1200A002 RAIN 12 100 24 rows selected SQL>