\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\
#tables:
t_doctors        t_location
id,name          doc_id,address
--------         ---------------
1,jack            1, street1
2,duh             1, street2
                  1, street3
                  2, str1
                  2, str2
                  2, str3
\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\
# Result Required
id,name,location
1,jack,"street1,street2,street3"
2,duh,"str1,str2,str3"