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How to concatenate field values based on a "GROUP BY" Field - How to use MySQL GROUP_CONCAT() function

How to use MySQL GROUP_CONCAT() function
How to concatenate field values based on a "GROUP BY" Field




Let's understand this with an example

There is a table "tbl_Locations" having 2 fields Location and State





Location State
Kochi KL
AlleppyKL
ChennaiTN
CoimbatoreTN
TrivandrumKL

Task is to get the Locations under a state as a comma separated string

ie, to show as given below

State Locations
KL Kochi,Alleppy,Trivandrum
TNChennai,Coimbatore


You can do this by using the MySQL GROUP_CONCAT() function

SYNTAX:
GROUP_CONCAT([DISTINCT] expr [,expr ...]
[ORDER BY {unsigned_integer | col_name | expr}
[ASC | DESC] [,col_name ...]]
[SEPARATOR str_val])

GROUP_CONCAT function concatenates values within each group defined by GROUP BY clause.

MySQL QUERY:
SELECT State, GROUP_CONCAT(Location) as Locations FROM tbl_Locations GROUP BY State;


Result:
State Locations
KL Kochi,Alleppy,Trivandrum
TNChennai,Coimbatore

Reference : MySQL GROUP_CONCAT()
Power of Group_Concat

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