問題與SQL請求，多個ID

Question

我有這兩個表，我需要從ENT表中選擇一切，並顯示技能的名稱不ID。

skill_1，skill_2，skill_3指idSkill從技能表

感謝您幫助

耳鼻喉科表：

+-------+---------+---------+---------+---------+ 
| idEnt | nameEnt | skill_1 | skill_2 | skill_3 | 
+-------+---------+---------+---------+---------+ 
|  1 | testA |  1 |  2 |  3 | 
|  2 | testB |  4 |  5 |  6 | 
+-------+---------+---------+---------+---------+ 

技能表：

+---------+-------------+ 
| idSkill | nameSkill | 
+---------+-------------+ 
|  1 | Storekeeper | 
|  2 | Designer | 
|  3 | Teacher  | 
|  4 | Baker  | 
|  5 | Gardener | 
|  6 | Secretary | 
+---------+-------------+ 

Answer 1

有了這張表的結構，你需要加入skill表3倍ent表，用不同的別名每次：

select idEnt, nameEnt, s1.nameSkill as skill1Name, s2.nameSkill as skill2Name, s3.nameSkill as skill3Name 
from ent e 
inner join skill s1 on e.skill_1=s1.idSkill 
inner join skill s2 on e.skill_2=s2.idSkill 
inner join skill s3 on e.skill_3=s3.idSkill 

你可能要考慮改變你的表結構，並有ent和skill表之間的連接表那持有idEnt - idSkill對。