MYSQL：如何在兩次引用同一張表的同一查詢上聯接兩個表

Question

我有兩張桌子。 我試圖將下面的兩個示例表與表1結合起來，兩次引用表2。 例如，如果我查看表1：第2組和成員7，則應在表2中查找ID，並提供以下輸出：

Group Members Name   Name
  2      7     Blue   Dog

表格1

Group  Members
 2       7
 3       8
 5       10

表2

 ID     Name
 1      Green
 2      Blue
 3      Yellow
 4      Orange
 5      Red
 6      Elephant
 7      Dog
 8      Cat
 9      Chicken
 10     Mouse

有什么建議嗎？ 謝謝

Answer 1

SELECT
  Table_1.*,
  g.Name,
  m.Name
FROM
  Table_1
  INNER JOIN Table_2 AS g ON Table_1.Group=g.ID
  INNER JOIN Table_2 AS m ON Table_1.Group=m.ID
WHERE
  Table_1.Group=2
  AND Table_1.Member=7

Answer 2

與表2在不同的列上連接兩次。

SELECT t1.*, t2.name AS group_name, t3.name AS member_name
FROM Table1 AS t1
JOIN Table2 AS t2 ON t1.group = t2.id
JOIN Table2 AS t3 ON t1.members = t3.id

Answer 3

很難從該描述中准確判斷出您需要什么，但是對表進行別名可能就是您所需要的。 它是這樣的：

SELECT t1.x, t2_1.y, t2_2.z
FROM table1 AS t1
JOIN table2 AS t2_1 ON t1.whatever = t2_1.whatever
JOIN table2 AS t2_2 ON t1.whatever = t2_2.whatever
...