您好，我在 SQL Server 2005 中遇到 SQL 问题。
假设我有一个名为 myTable 的表，其数据如下:
| NAME | CREDIT | GRADE | YEAR | SEMESTER |
---------------------------------------------
| Name1 | 1 | A | 1 | 1 |
| Name2 | 4 | B | 1 | 1 |
| Name3 | 2 | E | 1 | 1 |
| Name4 | 7 | F | 1 | 1 |
| Name5 | 4 | A | 1 | 2 |
| Name6 | 3 | C | 1 | 2 |
| Name7 | 6 | D | 1 | 2 |
| Name8 | 1 | A | 1 | 2 |
| Name9 | 1 | A | 1 | 2 |
| Name10 | 1 | A | 1 | 2 |
| Name11 | 3 | C | 2 | 1 |
| Name12 | 6 | E | 2 | 1 |
| Name13 | 4 | C | 2 | 1 |
| Name14 | 2 | B | 2 | 2 |
| Name15 | 1 | A | 2 | 2 |
| Name16 | 1 | A | 2 | 2 |
| Name17 | 1 | A | 2 | 2 |
| Name18 | 5 | D | 3 | 1 |
| Name19 | 1 | A | 3 | 1 |
| Name20 | 1 | A | 3 | 1 |
| Name18 | 5 | D | 3 | 2 |
| Name19 | 1 | A | 3 | 2 |
| Name20 | 1 | A | 3 | 2 |
我想输出如下结果:
| NAM1 | CRDT1 | GRD1 | YEAR1 | SEMER1 | NAM2 | CRDT2 | GRD2 | YEAR2 | SEMES2 |
-----------------------------------------------------------------------------
| Name1| 1 | A | 1 | 1 |Name5 | 4 | A | 1 | 2 |
| Name2| 4 | B | 1 | 1 |Name6 | 3 | C | 1 | 2 |
| Name3| 2 | E | 1 | 1 |Name7 | 6 | D | 1 | 2 |
| Name4| 7 | F | 1 | 1 |Name8 | 1 | A | 1 | 2 |
|Name9 | 1 | A | 1 | 2 |
|Name10| 1 | A | 1 | 2 |
| Name11| 3 | C | 2 | 1 |Name14| 2 | B | 2 | 2 |
| Name12| 6 | E | 2 | 1 |Name15| 1 | A | 2 | 2 |
| Name13| 4 | C | 2 | 1 |Name16| 1 | A | 2 | 2 |
|Name17| 1 | A | 2 | 2 |
| Name18| 5 | D | 3 | 1 |Name18| 5 | D | 3 | 2 |
| Name19| 1 | A | 3 | 1 |Name19| 1 | A | 3 | 2 |
| Name20| 1 | A | 3 | 1 |Name20| 1 | A | 3 | 2 |
哪里
- Nam1= Name in Semester 1
- CRDT1= Credit in Semester 1
- GRD1= Grade in Semester 1
- Year1= Year in Semester 1
- Semer1 = Semester in Semester 1
- Nam2= Name in Semester 2
- CRDT2= Credit in Semester 2
- GRD2= Grade in Semester 2
- Year2= Year in Semester 2
- Semer2 = Semester in Semester 2
请转到此 URL 来测试此 SQL:http://sqlfiddle.com/#!3/196c6/1
如何创建 SQL 来生成这样的输出？
最佳答案
select
s1.Name as nam1, s1.credit as crdt1, s1.Year as year1, s1.semester as semer1,
s2.Name as nam2, s2.credit as crdt2, s2.Year as year2, s2.semester as semer2
from
(select *, ROW_NUMBER() over (partition by year order by name) rn from myTable where semester=1 ) s1
full outer join
(select *, ROW_NUMBER() over (partition by year order by name) rn from myTable where semester=2 ) s2
on s1.year = s2.year
and s1.rn = s2.rn
关于sql - 交叉表多列，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/11972350/