我有三个表,例如:
看表
id(int) name(varchar) ref(int)
1 tissot 1234567
2 addidas 7654321
3 nike 8976543
属性表
id(int) name(varchar)
1 water_resistant
2 material_body
3 material_bracelet
4 watch_type
属性_ Material 表
watch_id property_id value
1 1 200
1 2 steel
1 3 leather
1 4 quartz
2 1 50
2 2 plastic
2 3 leather
2 4 quartz
3 1 100
3 2 steel
3 3 rubber
3 4 mechanical
我想获取所有具有属性的 watch ,例如:
- 防水 >= 100
- material_body = 钢或塑料
- material_bracelet = 皮革或橡胶
- watch 类型 = quartz 。
请帮我创建查询。属性可以在 100 左右。 在理想情况下,我想要得到结果:
watch_id name ref water_res mat_body mat_bracelet watch_type
1 tissot 1234 200 steel leather quartz
我正在尝试:
select
w.*, pm.value,pm.property_id
from
watch w
join
property_material pm
on w.id = pm.watch_id
where
pm.pid in (1,2,3)
and
pm.value in ('100','Steel','Leather');
但是这个查询返回所有记录,当值为 Steel 或 Leather 时,但是我需要 material_body 是 Steel 和 material_bracelet 是 Leather,例如。
更新:您对这个查询有什么看法?
select
name, ref
from
watch w
join
(SELECT w.id
FROM watch w
JOIN property_material pm on w.id = pm.watch_id
WHERE (pm.property_id = 1 AND pm.value > 100)
OR (pm.property_id = 2 AND pm.value IN ('steel','plastic'))
OR (pm.property_id = 3 AND pm.value IN ('leather','rubber'))
OR (pm.property_id = 4 AND pm.value = 'quartz')
Group by w.id
Having count(*) = 4) as t1
on t1.id = w.id;
最后更新:
select
w.name,
max(if(pm.property_id='1',pm.value,'')) water_resistant,
max(if(pm.property_id='2',pm.value,'')) material_body,
max(if(pm.property_id='3',pm.value,'')) material_bracelet,
max(if(pm.property_id='4',pm.value,'')) watch_type
from
watch w
join
(
SELECT w.id
FROM watch w
JOIN property_material pm on w.id = pm.watch_id
WHERE (pm.property_id = 1 AND pm.value > 100)
OR (pm.property_id = 2 AND pm.value IN ('steel','plastic'))
OR (pm.property_id = 3 AND pm.value IN ('leather','rubber'))
OR (pm.property_id = 4 AND pm.value = 'quartz')
Group by w.id
Having count(*) = 4
) as t1 on t1.id = w.id
join property_material pm on w.id = pm.watch_id
GROUP BY w.id
最佳答案
这里有几个可以满足您需求的查询。但如你所见,它们都是独立的。这就是为什么我在评论中询问您到底需要什么。
要进行更多测试,请使用此 SQL Fiddle sample code使用您提供的示例数据。
编辑 添加了新查询以将所有条件和所有结果都放在一个集合中。检查SQL Fiddle sample code here .
SELECT w.name,ref,property_id,value
FROM watch w
JOIN property p on w.id = p.id
JOIN property_material pm on p.id = pm.property_id
WHERE (p.id = 1 AND pm.value > 100)
OR (p.id = 2 AND pm.value IN ('steel','plastic'))
OR (p.id = 3 AND pm.value IN ('leather','rubber'))
OR (p.id = 4 AND pm.value = 'quartz');
独立查询:
SELECT w.name Watch_name, p.name Property_name, pm.value Property_value
FROM watch w
JOIN property_material pm ON w.id = pm.watch_id
JOIN property p ON p.id = pm.property_id
WHERE p.id = 1
AND pm.value > 100;
WATCH_NAME PROPERTY_NAME PROPERTY_VALUE
tissot water_resistant 200
另一个:
SELECT w.name Watch_name, p.name Property_name, pm.value Property_value
FROM watch w
JOIN property_material pm ON w.id = pm.watch_id
JOIN property p ON p.id = pm.property_id
WHERE p.id = 2
AND pm.value IN ('steel','plastic');
WATCH_NAME PROPERTY_NAME PROPERTY_VALUE
tissot material_body steel
addidas material_body plastic
nike material_body steel
另一个:
SELECT w.name Watch_name, p.name Property_name, pm.value Property_value
FROM watch w
JOIN property_material pm ON w.id = pm.watch_id
JOIN property p ON p.id = pm.property_id
WHERE p.id = 3
AND pm.value IN ('leather','rubber');
WATCH_NAME PROPERTY_NAME PROPERTY_VALUE
tissot material_bracelet leather
addidas material_bracelet leather
nike material_bracelet rubber
另一个:
SELECT w.name Watch_name, p.name Property_name, pm.value Property_value
FROM watch w
JOIN property_material pm ON w.id = pm.watch_id
JOIN property p ON p.id = pm.property_id
WHERE p.id = 4
AND pm.value = 'quartz';
WATCH_NAME PROPERTY_NAME PROPERTY_VALUE
tissot watch_type quartz
addidas watch_type quartz
关于Mysql多对多关系多条件,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/13063497/