MySQL - Select concatenate 2 values with 1 id -

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for example, have table 'map':

 map:  id | place __________ 1  | 1  | b 2  | 2  | b 2  | c

what mysql query can use me have following results:

 id | place __________ 1  | a,b 2  | a,b,c

you should use group_concat() function this. can use follows.

select id,group_concat(distinct place order place asc separator ',')  map group id

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