MySQL复杂加入

Question

我有两个表（vehicles，available_colors）如下，

车辆

id  vehicle_name
--  ------------
1   Honda Dio
2   Yamaha FZ
3   RE Classic 350

available_colors

id  vehicle_id  color
--  ----------  ----
1   1           Red
2   1           Yello
3   1           White
4   1           Black
5   2           Metalic Red
6   2           Metalic Black
7   2           Metalic Blue
8   3           Classic Red
9   3           Classic Black
10  3           Classic Silver

我想用以下标准执行操作

IF available_colors.color LIKE '%Metalic Red%'

THEN return that "vehicle" with all the "available colors",

如下，

id  vehicle_name    color
--  ------------    ----- 
2   Yamaha FZ       Metalic Red
2   Yamaha FZ       Metalic Black
2   Yamaha FZ       Metalic Blue

Answer 1

SELECT * FROM vehicles V1 
JOIN  available_colors AC1 ON V1.id = AC1.vehicle_id
WHERE EXISTS 
( SELECT * FROM available_colors ac 
where ac.vehicle_id = v.id and ac.color like '%Metalic Red%')

Answer 2

这个问题有两个部分 - 第一部分是用相应的颜色连接每辆车。第二，只选择金属红中存在的车辆：

SELECT        vehicles.id, vehicle_name, color
FROM          vehicles
JOIN          available_colors ON vehicles.id = available_colors.vehicle_id
WHERE EXISTS (SELECT 1
              FROM   available_colors
              WHERE  color LIKE '%Metallic Red%' AND 
                     vehicles.id = available_colors.vehicle_id)

Answer 3

加入两个表并尝试：

select a.id, a.vehicle_name, b.color from vehicles a inner join available_colors b on 
a.id=b.vehicle_id where b.color like '%Metallic red%'

Answer 4

您的查询应该是这样的

Select v.vehicle_name,ac.color From vehicles v LEFT JOIN available_colors ac ON ac.vehicle_id = v.id WHERE ac.color LIKE %Metalic%

Answer 5

如果您愿意为每辆车获得单行颜色，您可以这样做：

select v.id, v.vehicle_name, group_concat(ac.color) as colors
from vehicles v join
     available_colors ac
     on v.id = ac.vehicle_id
group by v.id, v.vehicle_name 
having sum(ac.color LIKE '%Metalic Red%) > 0;