我想用语句在表里面添加一个自动编号的列,好进行排序
该怎么写语句?
alter table tablename add column id int identity(1,1)
1.如果是改表结构,则参考一楼.
2.如果是查询,2000用子查询,2005用row_number等函数.
相关内容见下:
SQL code表jh03有下列数据:
name score
aa 99
bb 56
cc 56
dd 77
ee 78
ff 76
gg 78
ff 50
1. 名次生成方式1,Score重复时合并名次
SELECT * , Place=(SELECT COUNT(DISTINCT Score) FROM jh03 WHERE Score >= a.Score)
FROM jh03 a
ORDER BY Place
结果
Name Score Place
---------------- ----------------- -----------
aa 99.00 1
ee 78.00 2
gg 78.00 2
dd 77.00 3
ff 76.00 4
bb 56.00 5
cc 56.00 5
ff 50.00 6
2. 名次生成方式2 , Score重复时保留名次空缺
SELECT * , Place=(SELECT COUNT(Score) FROM jh03 WHERE Score > a.Score) + 1
FROM jh03 a
ORDER BY Place
结果
Name Score Place
--------------- ----------------- -----------
aa 99.00 1
ee 78.00 2
gg 78.00 2
dd 77.00 4
ff 76.00 5
bb 56.00 6
cc 56.00 6
ff 50.00 8