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MySql中关于某列中相同数值连续出现次数的统计_MySQL

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Release: 2016-06-01 13:36:09
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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.bitsCN.com  

100

101

102

100

100

103

104

102

102

105

106

101

101

输出如下:  www.bitsCN.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 |

 

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