使用两个表解码多于ID

Question

TABLE PEDIDO

id_name | ID_cabimento | ID_direction

1 | 4 | 5
2 | 3 | 6
3 | 4 | 5

TABLE USER

id_name | name

1 | João
2 | Maria
3 | António
4 | Manuel

我想要结果

name | cabimento | direction

João | Manuel | Tozé
Maria | António | Joaquim
António | Manuel | Tozé
...

我尝试了UNION和JOIN，但没有得到理想的结果...因为我只能解码1个ID。

Answer 1

你可以在同一张桌子上加入n次，只需使用n个别名

select n.name as name, c.name as cabimento, d.name as direction
from pedido p
inner join user n on p.id_name = n.id_name
inner join user c on p.id_name = c.id_cabimento
inner join user d on p.id_name = d.id_direction