Mysql别名内部联接链问题

Question

我有以下查询

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。

我希望将括号中的内部连接的对象别名为io，但出现语法错误：

检查与您的MySQL服务器版本相对应的手册以获取正确的语法，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

看来您是要这样做：

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