Mysql 如何从多个表中获取数据？

我想要的是tbmedAssign where zoneid或作为参数给定的区域名称中的所有记录。 如何为此编写查询？ 请帮忙

表名 塔布森

zone_id(PK)   ZoneName
-----------   --------
1             east
2             west
3             north
4             south

tbluser

usrId(PK) userzoneId(FK to tblzone)   username
--------  -------------------------   ------------
1         1                           manish
2         3                           rahul
3         2                           ankit
4         4                           amir
5         2                           rashmi
6         1                           akash
tbldoctor

docId(PK)    usrId(Fk to tbluser)      docname
--------     --------------------      ------------
1             2                        hemant
2             2                        chintu
3             3                        rahim
4             1                        salman
5             3                        kishor
6             3                        saurabh
7             2                        banti

tblmedAssign 

transId(Pk)  doctorId(FK to tbldoctor)    medId(FK)    dateInsert
----------   -------------------------    ------   -----------
1            2                            2        20/12/2012
2            3                            3        21/12/2012
3            2                            3        23/12/2012
4            4                            1        24/12/2012

TBL媒体

medid(PK)   medianame 
---------   ---------
1           casfung 
2           inem 
3           media1
4           tplan
5           casfung test 

我想要tblmedAssign中的所有记录，其中医生属于tbluser中的特定用户，而在tbluser中，用户属于特定区域，并且区域id作为参数提供？例如，zoneid=1

---

我也想在记录中选择medianame

基本上，您需要将四个表与其链接列连接起来。试试这个

SELECT  a.*,
        b.*,
        c.*,        
        d.*,
        e.*
FROM    tblmedAssign a
        INNER JOIN tblDoctor b
            ON a.doctorID = b.docID
        INNER JOIN tblUser c
            ON b.usrID = c.usrID
        INNER JOIN tblZone d
            ON c.userzoneID = d.zone_ID
        INNER JOIN tblmedAssign e
            ON e.medid = a.medid
WHERE   d.zone_id = @zone_id OR    -- supply value here
        d.zoneName = @zoneName

---

通过

JOIN

ing这三个表，类似于：

SELECT -- what you want to select
FROM tblmedAssign ta
LEFT JOIN tbldoctor td ON ta.doctorId = td.docId
LEFT JOIN tbluser tu ON td.usrId = tu.usrId
LEFT JOIN tablzone tz ON tu.userzoneId = tz.zone_Id
WHERE tz.zone_Id = @zoneIdParam

---

这应该符合你的目的

select * 
from
tblmedAssign, tbldoctor, tbluser, tablzone 
where
tblmedAssign.doctorId = tbldoctor.docId and 
tbldoctor.usrId = tbluser.usrId and 
tbluser.userzoneId =  tablzone.zone_id and 
(tablzone.zone_id = x or tablzone.ZoneName = 'y')

---

你的解释需要澄清一下。thanx john这是有效的。我可以问几个更复杂的问题吗？@ManishMalviya当然可以。如果可以：Djohn我又更新了1个表tblmedia我想选择特定记录的medianame。并且

tblmedia

connected在哪里？@ManishMalviya看到更新的答案：D希望它能工作。

select * 
from
tblmedAssign, tbldoctor, tbluser, tablzone 
where
tblmedAssign.doctorId = tbldoctor.docId and 
tbldoctor.usrId = tbluser.usrId and 
tbluser.userzoneId =  tablzone.zone_id and 
(tablzone.zone_id = x or tablzone.ZoneName = 'y')