Question

有没有人知道如何在内部连接和别名值内进行，以便它们不会相互覆盖？如果你看到我的代码，可能会更清楚：

    SELECT  home, away, g.network, g.date_start 
    FROM    game g
    INNER JOIN team t ON (
        (t.importid = g.home) as home
        OR
        (t.importid = g.away) as away
    )
    ORDER BY date_start DESC 
    LIMIT 7

已解决（以下帮助是我的最终查询）

    SELECT 
        home.market AS home_market, 
        away.market AS away_market, 
        g.network, 
        g.date_start

    FROM game AS g
    INNER JOIN team AS home ON (
        home.importid = g.home
    )
    INNER JOIN team AS away ON (
        away.importid = g.away
    )

    ORDER BY g.date_start DESC 
    LIMIT 7

Answer 1

你需要加入两次：

SELECT home.*, away.*, g.network, g.date_start 
FROM game AS g
INNER JOIN team AS home
  ON home.importid = g.home
INNER JOIN team AS away
  ON away.importid = g.away
ORDER BY g.date_start DESC 
LIMIT 7

Answer 2

使用单独的列指示连接条件

SELECT  t.importid, 
        case 
            when t.importid = g.home 
            then 'home' 
            else 'away' 
        end as join_condition, 
        g.network, 
        g.date_start 
FROM    game g
INNER JOIN team t ON (t.importid = g.home OR t.importid = g.away)
ORDER BY date_start DESC 
LIMIT 7

MySQL INNER JOIN别名

2 个答案: