Question

这是我的数据库结构：

payment option:
    mshiptype_id
    paymopt_Id 

membertopaymentoption:
    member_Id
    paymopt_Id

mshiptypes
    mshiptype_name
    mshiptype_id
    timetable_id 

timetables
    timetable_id
    timetable_Name 

timeslots
    timeslot_id
    timeslot_name

timeslottotimetables
    timeslot_id
    timetable_id

我想获得单个成员的mshiptype_name和timeslot_name以及timetable_name

使用上表

任何人都可以在mysql

中提供关于连接查询的建议

Answer 1

我认为这就是你想要的：

SELECT mshiptypes.mshiptype_name, timeslots.timeslot_name, timetables.timetable_Name
FROM membertopaymentoption
INNER JOIN paymentoption ON membertopaymentoption.member_Id=paymentoption.paymopt_Id
INNER JOIN mshiptypes ON paymentoption.mshiptype_id=mshiptypes.mshiptype_id
INNER JOIN timetables ON mshiptypes=timetable_id=timetables.timetable_id
INNER JOIN timesslottotimetables ON timetables.timetable_id=timeslottotimetables.timeslot_id
INNER JOIN timeslots ON timeslottotimetables.timeslot_id=timeslots.timeslot_id
WHERE membertopaymentoption.member_Id=$id

注意：将WHERE子句中的$id替换为实际的memeber ID

Answer 2

诀窍是识别两个不同表共有的字段，并尝试找到链接所需字段的路径。

select
    mtpo.member_Id,
    mt.mshiptype_name,
    ts.timeslot_name,
    tt.timetable_name
from
    payment_option po
    left join membertopaymentoption mtpo on po.paymopt_Id = mtpo.paymopt_Id
    left join mshiptypes mt on mt.mshiptype_id = po.mshiptype_id
    left join timetables tt on tt.timetable_id= mt.timetable_id
    left join timeslottotimetables tstt on tstt.timetable_id = tt.timetable_id
    left join timeslots ts on ts.timeslot_id = tstt.timeslot_id
where
    member_Id = 1  -- change this

另外，我建议在它们来得太晚之前整理你的字段和表格的名称。他们很乱！

Answer 3

SELECT mshiptype_name, timeslot_name, timetable_name
FROM mshiptypes ST
INNER JOIN paymentoption PO ON ST.mshiptype_id = PO.mshiptype_id
INNER JOIN membertopaymentoption  MPO ON PO.paymopt_Id = MPO.paymopt_Id
INNER JOIN timetables TT ON ST.timetable_id = TT.timetable_id
INNER JOIN timeslottotimetables TTT ON TT.timetable_id = TTT.timetable_id
INNER JOIN timeslotss TS ON TTT.timeslot_id = TS.timeslot_id
WHERE  MPO.member_id = <members_id>

Answer 4

select mt. mshiptype_name, ts. timeslot_name, tt. timetable_Name
from  membertopaymentoption mtp
inner join payment p on mtp. paymopt_Id = p.paymopt_Id
inner join mshiptypes mt on p.mshiptype_id = m.mshiptype_id
inner join timetables tt on mt.timetable_id = tt. timetable_id
inner join timeslottotimetables tstt on tt timetable_id = tstt. timetable_id
inner join timeslots ts on tstt. timeslot_id = ts. timetable_id
where mtp. member_Id = @memID //will be provided

Answer 5

select
    mshiptype_name,
    timeslot_name,
    timetable_name
from
    paymentoption
    natural join membertopaymentoption
    natural join mshiptypes
    natural join timetables        
    natural join timeslottotimetables
    natural join timeslots
where
    member_Id = 1

关于Mysql中的JOIN查询

5 个答案: