Question

we have three tables.

tblA

id(PK)      doc_id(fk)     mr_id(fk)       date 
--------    ----------     --------        ---------
1             23            22             2012-05-23
2             24            22             2012-05-23
3             25            21             2012-05-24
4             26            22             2012-05-24



tblB 

doc_id(PK)      d_name          d_segId(FK)    mr_id(FK)  
------------    -------------   ----------     ---------- 
     1          manish           1              12
     23         rahul            2              22
     24         paul             1              22
     25         jacky            1              21
     26         amit             2              22



tblC
seg_id(PK)      seg_name       seg_color        
--------        ----------     --------       
1               A_corei         red             
2               Bcorec          green          

what i want is all the record from tblA where mr_id=22 and date=’2012-05-23′ and order by seg_name in tblC

doc_id is referenced to tblB and
on the basis of doc_id, Seg_id is referenced to tblC how to use join in this situation.

It should look like

id           doc_id      d_name        seg_color
--------    ---------   ---------      ----------
1            23          rahul         green  
2            24          paul          red

Answer 1

SELECT
    tblA.id,
    tblA.doc_id,
    tblB.d_name,
    tblC.seg_color
FROM
    tblA, tblB, tblC
WHERE
    tblA.doc_id = tblB.doc_id
    AND
    tblB.d_segId = tblC.seg_id
    AND
    tblA.mr_id = 22
    AND
    tblA.date = '2012-05-23'
ORDER BY
    tblC.seg_name