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我有两张桌子product，specs如果至少有一个规格与 WHERE 匹配，我想获得产品和 group_concat（所有规格）。这是我到目前为止所拥有的，但它只返回与 WHERE 匹配的一个规范。

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    |
-----------------------------------
4

1 回答 1

1

您可以使用IN在WHERE子句中使用 a 的以下内容：

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

请参阅SQL Fiddle with Demo。

或者您可以使用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

请参阅带有演示的 SQL Fiddle

两者都给出结果：

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

如果您不想使用子查询，则可以使用HAVING子句过滤具有以下值的记录：

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%'

请参阅带有演示的 SQL Fiddle

于 2013-02-06T20:09:48.650 回答