Mysql別名內部聯接鏈問題

Question

我有以下查詢

select *
from
    reservation r,
    (
        assignment a
        INNER JOIN class_ c ON a.class_id = c.uniqueid
        INNER JOIN scheduling_subpart ss ON c.subpart_id = ss.uniqueid
        INNER JOIN instr_offering_config ioc ON ss.config_id = ioc.uniqueid
    ) as io
where
    io.solution_id in (32931842) and
    io = r.offering_id

注意：solution_id是分配表上的列。

我希望將括號中的內部連接的對象別名為io，但出現語法錯誤：

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“ as io其中使用（32931842）中的io.solution_id和io = r.offering_id”附近使用

Answer 1

看來您是要這樣做：

select *
from
reservation r,
(
    select * from assignment a ///  You missed the  select * from 
    INNER JOIN class_ c ON a.class_id = c.uniqueid
    INNER JOIN scheduling_subpart ss ON c.subpart_id = ss.uniqueid
    INNER JOIN instr_offering_config ioc ON ss.config_id = ioc.uniqueid
) as io
where
io.solution_id in (32931842) and
io = r.offering_id