聯接錯誤與多個表

Question

我正在嘗試將多個表連接在一起，只獲得一些字段

這是我的SQL代碼：

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語法有誤； 檢查與您的MySQL服務器版本相對應的手冊以獲取正確的語法，以在'match AS t1附近使用

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

'在第2行

我一直在弄亂它，但是我什么也沒辦法。...任何想法都說明為什么它不起作用？

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子句都應定義表名或表聯接中已跟隨的表名與先前的結果集之間的關系。

Answer 2

MATCH是函數名稱，因此是保留字。 嘗試使用標准名稱的表名和數據庫名稱作為前綴：

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match嘗試使用[match]，即在[和]之間包含匹配