使用共享子查询优化MySQL子查询

根据这些表，我编写了这个子查询，并根据需求给出了结果

需要专家指导来改进此查询，或者我们是否也可以对这些表使用join

查询：

select ps,st from pac where con in (select 
config from config where logi in 
( select id from logicalnode where physi 
in (select id from ysicalnode where mas =11)));

您可以在下面尝试-使用JOIN

试试这个

    select pa,sta 
    from 
   pack p
    INNER JOIN
  confi c
    ON
    p.confi = c.idco
    INNER JOIN
   logice l
    ON
    c.logic = l.id
    INNER JOIN
  physiode pn
    ON
    l.physicalnodeid  = pn.id
    WHERE macaddress =123

您可以尝试使用exists：

使用左连接

---

请提供示例数据和所需结果。请在代码中添加一些解释。

    select pa,sta 
    from 
   pack p
    INNER JOIN
  confi c
    ON
    p.confi = c.idco
    INNER JOIN
   logice l
    ON
    c.logic = l.id
    INNER JOIN
  physiode pn
    ON
    l.physicalnodeid  = pn.id
    WHERE macaddress =123

select payloadstr,starttime from packetdb.packet p
where exists(select 1 from packetdb.configuration c
             where p.configid = id
             and exists(select 1 from packetdb.logicalnode l
                          where c.logicalnodeid = id
                          and exists(select 1 from packetdb.physicalnode
                                     where macaddress = 117769729
                                     and l.physicalnodeid = id)

select payloadstr,starttime 
from packet 
left join Configuration on Configuration.IDconfig = packet.configID
left join logicalnode on logicalnode.ID = Configuration.logicalnodeid
left join physicalnode on physicalnode.ID = logicalnode.physicalnodeid
 where macaddress =117769729

SELECT
    payloadstr
    ,starttime
FROM packetdb.packet
INNER JOIN packetdb.configuration
    ON packetdb.packet.configid = packetdb.configuration.idconfig
INNER JOIN packetdb.logicalnode
    ON packetdb.configuration.idconfig = packetdb.logicalnode.id
INNER JOIN packetdb.physicalnode
    ON packetdb.logicalnode.physicalnodeid = packetdb.physicalnode.id and packetdb.physicalnode.macaddress=117769729