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  • Live2D
  • 背景

    1、分两个维度,统计数据并形成一个二维数据展现形式
    
    2、横轴标为统计维度1,纵轴为统计维度2
    
    横轴x区分为:x<=5,5<x<10,x>10
    纵轴y区分为:y<=5,5<y<10,y>10
    
    形成如下图表格数据
    

      

    维度2-->维度1x<=55<x<10x>10
    y<=5 20 3 1
    5<x<=10 1 2 1
    y>10 0 0 1

    步骤一:先统计出单笔两个维度的值

    select user,x,y from test01
    

      

    如图

    userxy
    A 1 2
    B 6 2
    C 5 10
    D 7 11
    E 11 2

    步骤二:维度划分打标记

    将每条记录的x,y划入到对应分级中,例如:
    记录:A,x=1,y=2 划入等级为 A (x<=5) (y<=5)
    记录:B,x=6,y=2 划入等级为 A (5<x<=10) (y<=5)
    

      

    select user 
    user,
    (case 
    	when x<=5 then 'x<=5' 
    	when x>5 and x<=10 then '5<x<=10' 
    	when x>10 then 'x>10'
    	else 'NULL' end) as tagX,
    (case 
    	when y<=5 then 'y<=5' 
    	when y>5 and y<=10 then '5<y<=10' 
    	when y>10 then 'y>10'
    	else 'NULL' end) as tagY
    from test01 
    

      

    结果如图:

    usertagXtagY
    A x<=5 y<=5
    B 5<x<=10 y<=5
    C x<=5 5<y<=10
    D 5<x<=10 y>10
    E x>10 y<=5

    步骤三:取维度1,维度2组合-group by的结果

    SQL如下

    select tagX,tagY,count(1) as cnt from (
      步骤二sql
    )t
    group by tagX,tagY
    

      

    即:

    select tagX,tagY,count(1) as cnt from (
        select user 
        user,
        (case 
        	when x<=5 then 'x<=5' 
        	when x>5 and x<=10 then '5<x<=10' 
        	when x>10 then 'x>10'
        	else 'NULL' end) as tagX,
        (case 
        	when y<=5 then 'y<=5' 
        	when y>5 and y<=10 then '5<y<=10' 
        	when y>10 then 'y>10'
        	else 'NULL' end) as tagY
        from test01 
    )t
    group by tagX,tagY
    

      

    结果如图:

    tagXtagYcnt
    5<x<=10 y<=5 1
    5<x<=10 y>10 1
    x<=5 5<y<=10 1
    x<=5 y<=5 1
    x>10 y<=5 1

    步骤四:将tagX转成横轴,tagY转成纵轴

    横轴:x<=5,5<x<=10,x>10 
    (由于纵轴需要占用一个空间所以需要虚拟一个顶级横轴)
    ---> (y/x)|x<=5|5<x<=10|x>10 
    
    纵轴:y<=5,5<y<=10,y>10
    
    需要将tagY group by tagX通过case when 横向平铺
    

      

    SQL如下:

    select 
    tagY as 'y/x', 
    sum(case when tagX ='x<=5' then cnt else 0 end) as 'x<=5',
    sum(case when tagX ='5<x<=10' then cnt else 0 end) as '5<x<=10',
    sum(case when tagX ='x>10' then cnt else 0 end) as 'x>10'
    from(
    	步骤三sql
    )m
    group by tagY
    

      

    即:

    select 
    tagY as 'y/x', 
    sum(case when tagX ='x<=5' then cnt else 0 end) as 'x<=5',
    sum(case when tagX ='5<x<=10' then cnt else 0 end) as '5<x<=10',
    sum(case when tagX ='x>10' then cnt else 0 end) as 'x>10'
    from(
    	select tagX,tagY,count(1) as cnt from (
    		select user 
    		user,
    		(case 
    			when x<=5 then 'x<=5' 
    			when x>5 and x<=10 then '5<x<=10' 
    			when x>10 then 'x>10'
    			else 'NULL' end) as tagX,
    		(case 
    			when y<=5 then 'y<=5' 
    			when y>5 and y<=10 then '5<y<=10' 
    			when y>10 then 'y>10'
    			else 'NULL' end) as tagY
    		from test01 
    	)t
      group by tagX,tagY
    )m
    group by tagY
    

    得最终结果如图:

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  • 原文:https://www.cnblogs.com/xiaoluohao/p/13791464.html
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