MySQL查询修改

Question

您好我写了这个查询

SELECT cl_brands.name AS Brand,DATE_FORMAT(cl_doctor_call.date_entered,'%b%y')AS MonthYear, 

SUM(FIND_IN_SET(CONCAT('^',cl_brands.id,'^'),cl_doctor_call_cstm.brand_discussed_c))AS No_Times_Brand_Discussed 
FROM cl_doctor_call LEFT JOIN cl_doctor_call_cstm ON 
cl_doctor_call.id=cl_doctor_call_cstm.id_c 
LEFT JOIN cl_brands ON 
CONCAT('^',cl_brands.id,'^') LIKE CONCAT(cl_doctor_call_cstm.brand_discussed_c, '%') 
WHERE (cl_doctor_call.date_entered) 
BETWEEN CURDATE()-INTERVAL 3 MONTH AND CURDATE() 
GROUP BY cl_brands.name,MonthYear 
ORDER BY No_Times_Brand_Discussed DESC limit 1 

该查询为我们提供了与品牌名称和monthyear讨论最高的品牌。

如：

Brand Monthyear No_Times_Brand_Discussed 
    x  Nov11    5 

现在我想展示品牌讨论的'同一品牌的'细节过去2个月（这意味着我的查询应返回结果所有同品牌的详细信息的详细过去2个月） 所以我的结果会是这样的。

Brand Monthyear No_Times_Brand_Discussed 

    x  Nov11    5 
    x  Oct11    0 
    x  Sep11    1 

告诉我如何修改我的上述查询，以便它能给我这个结果。

Answer 1

如果我正在阅读此权利，本质上，您只需按照日期排列的最受欢迎的品牌的前3名结果。所以，你只需要以同样的方式查询你的原始表格，但是包含一个“in”子句，它将你限制在最讨论的品牌中。我会使用ID而不是名称字段，因此您知道它是唯一的。我假设字段名称是“brand_id”，但在表格中可能有所不同。

select cl_brands.name AS Brand,DATE_FORMAT(cl_doctor_call.date_entered,'%b%y')AS MonthYear, 
SUM(FIND_IN_SET(CONCAT('^',cl_brands.id,'^'),cl_doctor_call_cstm.brand_discussed_c))AS No_Times_Brand_Discussed 
from cl_doctor_call LEFT JOIN cl_doctor_call_cstm ON 
cl_doctor_call.id=cl_doctor_call_cstm.id_c 
LEFT JOIN cl_brands ON 
CONCAT('^',cl_brands.id,'^') LIKE CONCAT(cl_doctor_call_cstm.brand_discussed_c, '%') 
where brand_id in 
(
    SELECT c1.brand_id 
    FROM cl_doctor_call LEFT JOIN cl_doctor_call_cstm ON 
    cl_doctor_call.id=cl_doctor_call_cstm.id_c 
    LEFT JOIN cl_brands ON 
    CONCAT('^',cl_brands.id,'^') LIKE CONCAT(cl_doctor_call_cstm.brand_discussed_c, '%') 
    WHERE (cl_doctor_call.date_entered) 
    BETWEEN CURDATE()-INTERVAL 3 MONTH AND CURDATE() 
    GROUP BY cl_brands.name,MonthY`enter code here`ear 
) 
order by date_entered 
limit 3