MYSQL: How to JOIN two tables on the same query referencing the same table twice

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心在旅途
心在旅途 2021-01-26 05:40

I have two tables. I\'m trying to JOIN the sample two tables below with table 1 referencing Table 2 twice. For example if I look at Table 1: Group 2 and Members 7, it should loo

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  • 2021-01-26 06:11

    Join with Table 2 twice on different columns.

    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
    
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  • 2021-01-26 06:12
    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
    
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  • 2021-01-26 06:14

    Hard to tell exactly what you need from that description but aliasing the tables may be what you need. It works like this:

    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
    ...
    
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