我需要根据动态添加的属性(转置表)来查询用户
我有4张桌子
- 用户-针对用户
- propertyGroup-对于属性组,可以将组动态添加到数据库中
- propertyValue-查找propertyGroup的可能值
- usersPropertyValues-将用户连接到其相关属性
它看起来是这样的:
users:
------
| id | name | details |
|----|------|---------|
| 1 | Joe | foo |
| 2 | Dan | bar |
propertyGroup:
--------------
| id | name |
|----|----------------|
| 1 | Hobbies |
| 2 | LikeFood |
| 3 | VisitedCountry |
propertyValue:
--------------
| id | propertyGroupId | name |
|----|-----------------|--------------|
| 1 | 1 | Technologies |
| 2 | 1 | Surfing |
| 3 | 2 | Rice |
| 4 | 2 | Meat |
| 5 | 2 | Veg |
| 6 | 3 | USA |
| 7 | 3 | FRANCE |
| 8 | 3 | ISRAEL |
| 9 | 3 | CANADA |
usersPropertyValues:
--------------------
| userId | propertyValueId |
|--------|-----------------|
| 1 | 1 |
| 1 | 2 |
| 1 | 3 |
| 1 | 5 |
| 1 | 6 |
| 1 | 7 |
| 1 | 8 |
| 2 | 2 |
| 2 | 3 |
| 2 | 4 |
| 2 | 5 |
| 2 | 8 |
| 2 | 9 |
| 2 | 7 |
所以一个混合em-all查询看起来是这样的:
select *
from users as u
join usersPropertyValues as upv on upv.userId = u.id
join propertyValues as pv on pv.id = upv.propertyValueId
join propertyGroup as pg on pg.id = pv.propertyGroupId
| id | name | details | userId | propertyValueId | id | propertyGroupId | name | id | name |
|----|------|---------|--------|-----------------|----|-----------------|--------------|----|----------------|
| 1 | Joe | foo | 1 | 1 | 1 | 1 | Technologies | 1 | Hobbies |
| 1 | Joe | foo | 1 | 2 | 2 | 1 | Surfing | 1 | Hobbies |
| 1 | Joe | foo | 1 | 3 | 3 | 2 | Rice | 2 | LikeFood |
| 1 | Joe | foo | 1 | 5 | 5 | 2 | Veg | 2 | LikeFood |
| 1 | Joe | foo | 1 | 6 | 6 | 3 | USA | 3 | VisitedCountry |
| 1 | Joe | foo | 1 | 7 | 7 | 3 | FRANCE | 3 | VisitedCountry |
| 1 | Joe | foo | 1 | 8 | 8 | 3 | ISRAEL | 3 | VisitedCountry |
| 2 | Dan | bar | 2 | 2 | 2 | 1 | Surfing | 1 | Hobbies |
| 2 | Dan | bar | 2 | 3 | 3 | 2 | Rice | 2 | LikeFood |
| 2 | Dan | bar | 2 | 4 | 4 | 2 | Meat | 2 | LikeFood |
| 2 | Dan | bar | 2 | 5 | 5 | 2 | Veg | 2 | LikeFood |
| 2 | Dan | bar | 2 | 8 | 8 | 3 | ISRAEL | 3 | VisitedCountry |
| 2 | Dan | bar | 2 | 9 | 9 | 3 | CANADA | 3 | VisitedCountry |
| 2 | Dan | bar | 2 | 7 | 7 | 3 | FRANCE | 3 | VisitedCountry |
一切都在这里:http://sqlfiddle.com/#!3/49329/1
我想通过一组propertyValueId查询数据,并获取与该组的属性集相匹配的所有用户,因此用户需要至少拥有每个组中的一个属性-换句话说,一个与通用CNF子句相匹配的where calause,如下所示:(pvId是propertyValueId的缩写)
Property group A Property group B Property group C
(pvId_x or pvId_y) and (pvId_w or pvId_z) and... and (pvId_m or pvId_k)
在上面的示例pvId_ x&pvId_y属于组A,pvId_w&pvId_z属于B组等
我没有工作,我试图将IN运算符的AND运算器(IN模拟或部分析取)连接到这里(查询上面的sql fiddle):
select distinct u.name, u.id
from users as u
join usersPropertyValues as upv on upv.userId = u.id
join propertyValues as pv on pv.id = upv.propertyValueId
join propertyGroup as pg on pg.id = pv.propertyGroupId
where (pv.propertyGroupId = 1 AND pv.id IN(1,2)) and (pv.propertyGroupId = 2 AND pv.id IN(5,6))
我没有得到两个用户(都有(1或2)和(5或6)),而是一个都没有。
我理解为什么结果集是空的,但我不理解如何实现right where子句。-如何做到这一点
我的问题:如何在上述SQL结构中实现CNF逻辑?
编辑:异常结果示例:(关于sqlfiddle示例:
input --> output
{1,5} --> Joe (user with hobby:tech, likefood:veg)
{2,8} --> Joe,Dan (user with hobby:surfing, VisitedCountry:Israel)
{2,8,9} --> Dan (user with hobby:surfing, VisitedCountry:Israel,Canada)
顺便说一句,我最终需要在JPA中实现这一点,所以如果JPA中有解决方案,那也很棒。但如果没有,我会翻译。。。感谢
根据我对您的注释的理解,您希望查询与两个属性值ID相关联的所有用户(因此{1,5}转到爱好:科技,喜欢食物:蔬菜的属性值ID)
一旦你这样表述它,很简单,首先得到一个列表,然后得到另一个列表并在两者中找到元素,如下所示:
select *
from users
where id in (
select userid from userPropertyValues where propertyvalueid = 1
intersect
select userid from userPropertyValues where propertyvalueid = 5
) sub
注意,我可以使用内部连接而不是交集运算符,但交集更性感。如果您的平台不支持它,只需使用联接即可。
加入:
select *
from users
join (select userid from userPropertyValues where propertyvalueid=1) a on a.userid = users.id
join (select userid from userPropertyValues where propertyvalueid=5) b on b.userid = users.id
或者更简单地表述为(这是AND条件-1和5)
select *
from users
join userPropertyValues a on a.userid = users.id and a.propertyvalueid=1
join userPropertyValues b on b.userid = users.id and b.propertyvalueid=5
(这是OR条件-1或5)
select *
from users
left join userPropertyValues a on a.userid = users.id and a.propertyvalueid=1
left join userPropertyValues b on b.userid = users.id and b.propertyvalueid=5
where coalesce(a.userid, b.userid) is not null
你也可以说
where a.userid is not null or b.userid is not null
---
从小提琴
select *
from users
where id in (
select userid from usersPropertyValues where propertyvalueid = 1
intersect
(
select userid from usersPropertyValues where propertyvalueid = 3
UNION ALL
select userid from usersPropertyValues where propertyvalueid = 4
)
);
让我们看看相交之前的部分是
select *
from users
join userPropertyValues a on a.userid = users.id and a.propertyvalueid=1
之后的部分是
select *
from users
left join userPropertyValues b on b.userid = users.id and b.propertyvalueid=1
left join userPropertyValues c on c.userid = users.id and c.propertyvalueid=5
where coalesce(b.userid, c.userid) is not null
所以把它们放在一起(两者都适用于相交,因为它与AND相同):
select *
from users
join userPropertyValues a on a.userid = users.id and a.propertyvalueid=1
left join userPropertyValues b on b.userid = users.id and b.propertyvalueid=1
left join userPropertyValues c on c.userid = users.id and c.propertyvalueid=5
where coalesce(b.userid, c.userid) is not null
我认为当您更改和通过或在where子句中时会有所帮助
其中(pv.propertiesGroupId=1 AND pv.id IN(1,2))或