mysql得到maser和所有細節，如果一個細節匹配條件

Question

我有兩個表product和specs我想獲得產品和group_concat（所有規格），如果至少有一個規格匹配的地方。 這是我到目前爲止，但它只返回匹配WHERE的一個規範。

select p.ID, p.name, p.manufacturer GROUP_CONCAT(s.specValue order by s.pID,',') 
from product as p 
JOIN spec AS s ON p.ID = s.pID 
WHERE s.specValue = 'micro' 
group by p.ID 

---

product table 
| ID | name | manufacturer | 
| 1 | Iphone | apple  | 
| 2 | galaxy | samsung | 
| 3 | note | samsung | 
------------------------------ 
spec table 
| ID | pID | specName | specVlaue | 
| 1 | 1 | charger | bad  | 
| 2 | 2 | charger | micro | 
| 3 | 2 | keypad | touch | 
| 4 | 4 | charger | micro | 
----------------------------------- 

Answer 1

您可以使用該WHERE子句中使用IN如下：

select p.ID, 
    p.name, 
    p.manufacturer, 
    GROUP_CONCAT(s.specValue order by s.pID,',') AllSpecs 
from product as p 
JOIN spec AS s 
    ON p.ID = s.pID 
WHERE p.ID in (select pID 
       from spec s1 
       where s1.specValue = 'micro') 
group by p.ID 

見SQL Fiddle with Demo。

或者你可以使用EXISTS：

select p.ID, 
    p.name, 
    p.manufacturer, 
    GROUP_CONCAT(s.specValue order by s.pID,',') AllSpecs 
from product as p 
JOIN spec AS s 
    ON p.ID = s.pID 
WHERE exists (select pID 
       from spec s1 
       where s1.specValue = 'micro' 
       and p.ID = s1.pid) 
group by p.ID 

見SQL Fiddle with Demo

均可以得到結果：

| ID | NAME | MANUFACTURER | ALLSPECS | 
-------------------------------------------- 
| 2 | galaxy |  samsung | touch,micro | 

如果你不想使用子查詢，你可以使用HAVING子句用以下值過濾記錄：

select p.ID, 
    p.name, 
    p.manufacturer, 
    GROUP_CONCAT(s.specValue order by s.pID,',') AllSpecs 
from product as p 
JOIN spec AS s 
    ON p.ID = s.pID 
group by p.ID 
having GROUP_CONCAT(s.specValue order by s.pID,',') like '%micro%' 

見SQL Fiddle with Demo