Group, Sort and Count in a single query

问题:

I'm trying to GROUP, SORT and COUNT in a single query one of my table named 'commodities'.

Here is a simplification of my MySql table :

family  sub_family  name        detailed_name  Agro    Grains      Wheat       Wheat per 1 mt Agro    Grains      Corn        Corn per 1 mt Agro    Grains      Sugar       Sugar per 1 mt Agro    Fruits      Apple       Apple red Agro    Fruits      Apple       Apple green Agro    Fruits      Apple       Apple yellow Agro    Fruits      Lemon       Lemon classic Wood    Tree        Lemon       Lemon in logs Wood    Tree        Oak         Oak in logs Wood    Tree        Epicea      Epicea in logs Wood    Packaging   Kraftliner  Krafliner 3mm 

I would like to :

1. GROUP by name
2. SORT by family, sub_family and lastly name
3. COUNTthe numbers of rows for each family, sub_family and then name (IN THE SAME sub_family)

So far I managed to do everything but COUNT in the same sub_family.

Indeed, the following query :

SELECT      TableC.family,     TableC.NbrFamily,     TableB.sub_family,     TableB.NbrSubFamily,     TableA.name,     TableA.NbrName FROM  (     SELECT          family,         sub_family,         name,         COUNT(DISTINCT commodities.id) AS NbrName      FROM commodities GROUP BY name ) TableA INNER JOIN  (     SELECT          sub_family,         COUNT(DISTINCT commodities.id) AS NbrSubFamily      FROM commodities GROUP BY sub_family ) TableB ON (TableA.sub_family = TableB.sub_family) INNER JOIN  (     SELECT          family,         COUNT(DISTINCT commodities.id) AS NbrFamily      FROM commodities GROUP BY family ) TableC ON (TableA.family = TableC.family) GROUP BY TableA.name ORDER BY TableA.family,TableA.sub_family,TableA.name 

which results in the following :

family  NbrFamily  sub_family  NbrSubFamily  name        NbrName Agro    7          Grains      3             Wheat       1        Agro    7          Grains      3             Corn        1         Agro    7          Grains      3             Sugar       1        Agro    7          Fruits      4             Apple       3 Agro    7          Fruits      4             Lemon       2 Wood    4          Tree        3             Lemon       2 Wood    4          Tree        3             Oak         1      Wood    4          Tree        3             Epicea      1   Wood    4          Packaging   1             Kraftliner  1 

You can see that NbrName counts Lemon 2 times but I would like it to count it only 1 time because one lemon is in Fruits sub_family and the other in Tree sub_family.

[UPDATE] : Here are my desired results :

   family  NbrFamily  sub_family  NbrSubFamily  name        NbrName     Agro    7          Grains      3             Wheat       1            Agro    7          Grains      3             Corn        1             Agro    7          Grains      3             Sugar       1            Agro    7          Fruits      4             Apple       3     Agro    7          Fruits      4             Lemon       1     Wood    4          Tree        3             Lemon       1     Wood    4          Tree        3             Oak         1          Wood    4          Tree        3             Epicea      1       Wood    4          Packaging   1             Kraftliner  1 

回答1:

Just my guess of what you are asking for http://sqlfiddle.com/#!9/e9206/16

because it brings desired result:

 SELECT A.family, C.NbrFamily,A.sub_family,B.NbrSubFamily,A.name,COUNT(A.Name)  FROM  commodities as A LEFT JOIN (   SELECT family,sub_family,COUNT(Name) AS NbrSubFamily    FROM commodities    GROUP BY family,sub_family ) B ON A.sub_family = B.sub_family    AND A.family = B.family  LEFT JOIN (   SELECT family,COUNT(Name) AS NbrFamily    FROM commodities    GROUP BY family ) C  ON  A.family = C.family  GROUP BY A.family,A.sub_family,A.name ORDER BY A.id 

文章来源: Group, Sort and Count in a single query