时间:2021-07-01 10:21:17 帮助过:98人阅读
MySql中关于某列中相同数连续出现次数的统计 原表如下: www.2cto.com 100 101 102 100 100 103 104 102 102 105 106 101 101 输出如下: www.2cto.com 100 1 101 2 102 3 100 4 100 4 103 5 104 6 102 7 102 7 105 8 106 9 101 10 101 10 sql如下: SET @t1
MySql中关于某列中相同数值连续出现次数的统计
原表如下: www.2cto.com
100
101
102
100
100
103
104
102
102
105
106
101
101
输出如下: www.2cto.com
100 1
101 2
102 3
100 4
100 4
103 5
104 6
102 7
102 7
105 8
106 9
101 10
101 10
sql如下:
SET @t1=0;
SET @tp=-1;
select
@t1 := @t1 + (case when @tp=n then 0 else 1 end) as c,
n,
@tp := n
from nums
order by n;
测试数据:
create table nums( n int );
insert into nums values (100), (101), (101), (102);
输出结果:
| C | N | @TP := N |
----------------------
| 1 | 100 | 100 |
| 2 | 101 | 101 |
| 2 | 101 | 101 |
| 3 | 102 | 102 |
create table nums( n int );
insert into nums values (100), (101), (101), (102);
SET @t1=0;
SET @tp=-1;
select @t1 := @t1 + (case when @tp=n then 0 else 1 end) as c, n, @tp := n
from nums GROUP BY n order by n ;
输出结果:
| C | N | @TP := N |
----------------------
| 1 | 100 | 100 |
| 2 | 101 | 101 |
| 3 | 102 | 102 |