Question

I have tables like

tbl_biodata:

id     : int           value=>1
name   : varchar(50)        value => mike
...

tbl_biodata_education

first row—

id         : int    value=>1
biodata_id : foreignkey to tbl_biodata.id   value => 1
level      : varchar(50)    value => bachelor
year       : int(4)     value => 2006

second row—

id         : int    value=>2
biodata_id : foreignkey to tbl_biodata.id   value => 1
level      : varchar(50)    value => masters
year       : int(4)     value => 2010

I have to export data such that the biodata won’t repeat more than one time and all the
repeated education from tbl_biodata_education lists as bachelor 2006, masters 2010

The final table would be:

id
name    => mike
education   =>  bachelor 2006, masters 2010

Solution from simon-at-mso-net

SELECT
        b.id,
        b.name,
        GROUP_CONCAT(be.education) AS education

FROM tbl_biodata b

LEFT JOIN (
    SELECT
        biodata_id,
        CONCAT(level,' ',year) AS education
    FROM tbl_biodata_education
) be
ON b.id = be.biodata_id
GROUP BY b.id

Answer 1

GROUP_CONCAT is your friend for getting the entries you need as a list, with 1 list per tbl_biodata record. I opted to suggest a subquery to get the data from tbl_biodata_education simply so that the education field could be CONCATed more cleanly before being GROUP_CONCATed in the outer query

SELECT
    b.id,
    b.name,
    GROUP_CONCAT(be.education) AS education

FROM tbl_biodata b

LEFT JOIN (
    SELECT
        biodata_id,
        CONCAT(level,' ',year) AS education
    FROM tbl_biodata_education
) be

on b.id = be.biodata_id

GROUP BY b.id