连接错误与多个表

Question

我试图将多个表连接在一起，只获得一些字段

这是我的sql代码：

SELECT t1.match_id, t1.provider_id, t1.visible, t2.match_type, t3.class_num, t3.location_id, t4.prov_name, t6.city_name
    FROM match AS t1 
        JOIN umtc_class AS t2
            on t1.match_id = t2.match_id
        JOIN abroad_class AS t3
            on t1.match_id = t3.match_id
        JOIN provider AS t4
            on t1.provider_id = t3.provider_id
        JOIN location AS t5
            on t3.location_id = t3.location_id
        JOIN location AS t6
            on t5.city_id = t6.city_id

1064 - 您的SQL语法出错;检查与您的MySQL服务器版本对应的手册，以便在＃t;匹配AS t1

附近使用正确的语法

    JOIN umtc_class AS t2
        on t1.match_id = t2.match_id

＆＃39;在第2行

我一直在搞乱它，但我无法到达任何地方......任何想法都解释为什么它不起作用？

Answer 1

FROM match AS t1 
    JOIN umtc_class AS t2
        on t1.match_id = t2.match_id
    JOIN abroad_class AS t3
        on t1.match_id = t3.match_id
    JOIN provider AS t4
        on t1.provider_id = t3.provider_id   --<-- This ON clause should have t4 in it
    JOIN location AS t5
        on t3.location_id = t3.location_id   --<-- This ON clause should have t5 in it
    JOIN location AS t6
        on t5.city_id = t6.city_id

任何ON子句都应该定义表名所遵循的表名与表或表的连接之前的结果集之间的关系。

Answer 2

MATCH是一个函数名，因此是一个保留字。尝试使用前置数据库名称的完全限定表名：

SELECT ...
FROM mydb.match AS t1

Answer 3

SELECT t1.match_id, t1.provider_id, t1.visible, t2.match_type, t3.class_num, t3.location_id, t4.prov_name, t6.city_name
    FROM match AS t1 
        JOIN umtc_class AS t2
            on t1.match_id = t2.match_id
        JOIN abroad_class AS t3
            on t1.match_id = t3.match_id
        JOIN provider AS t4
            on t1.provider_id = t4.provider_id  //here was mistake
        JOIN location AS t5
            on t3.location_id = t5.location_id //here was mistake
        JOIN location AS t6
            on t5.city_id = t6.city_id

Answer 4

而不是使用匹配尝试使用[匹配]，即封闭[和]

之间的匹配