SQL 每个行组合的总计

Question

是否有任何类型的聚合函数可以帮助计算以下内容？

如果我有以下数据，我想要每个重复行的总和。

   date    |  country     | color | measure |  left | position 
---------------------------------------------------------------
2020-02-01  united states  red        33       5.3      none  
2020-02-01  united states  red        33       5.3      none  
2020-02-01  united states  red        33       5.3      none  
2020-02-03  vietnam        green      44       9.2      none  
2020-02-01  united states  red        33       5.3      none  
2020-02-01  united states  red        33       5.3      none  
2020-02-03  vietnam        green      44       9.2      none  
2020-02-01  canada         yellow     20       3.1      none  
2020-02-06  mexico         orange     2        9.0      miss
2020-02-06  mexico         red        1        3.0      none

输出将提供 total 每行出现的数字：

   date    |  country     | color | measure |  left | position | total
-----------------------------------------------------------------------
2020-02-01  united states  red        33       5.3      none      5
2020-02-03  vietnam        green      44       9.2      none      2
2020-02-01  canada         yellow     20       3.1      none      1
2020-02-06  mexico         orange     2        9.0      miss      1
2020-02-06  mexico         red        1        3.0      none      1

Answer 1

为什么旧的 group by 和 count 不好？

  select date,
         country,
         color,
         measure,
         left,
         position,
         count(1) as total      
    from MyTable
group by date,
         country,
         color,
         measure,
         left,
         position

SQL 每个行组合的总计

SQL total for each row combination

sql

postgresql

aggregate-functions