mysql> CREATE TABLE group_concat_test (
->id INT UNSIGNED NOT NULL auto_increment 
->PRIMARY KEY,
->_key INT UNSIGNED NOT NULL,
->_value CHAR(1) NOT NULL);
Query OK, 0 rows affected (0.00 sec)

mysql> INSERT INTO group_concat_test
->(_key, _value) VALUES
->(1, 'b'),
->(1, 'c'),
->(2, 'a'),
->(2, 'd'),
->(2, 'c'),
->(3, 'b'),
->(3, 'e');
Query OK, 7 rows affected (0.01 sec)
Records: 7  Duplicates: 0  Warnings: 0

mysql> SELECT _key,    
->COUNT(*) as cnt,
->GROUP_CONCAT(_value ORDER BY _value 
->SEPARATOR ', ')
->as value_list
->FROM group_concat_test
->GROUP BY _key
->ORDER BY _key;
+------+-----+------------+
| _key | cnt | value_list |
+------+-----+------------+
|    1 |   2 | b, c       |
|    2 |   3 | a, c, d    |
|    3 |   2 | b, e       |
+------+-----+------------+
3 rows in set (0.00 sec)

mysql> create table map_test
    -> (
    ->   name varchar(100) not null,
    ->   loc  geometry,
    ->   primary key(name)
    ->   spatial index(loc)
    -> );
Query OK, 0 rows affected (0.00 sec)

mysql> insert into map_test values 
    -> (('One Two', point(1,2));
Query OK, 1 row affected (0.00 sec)

mysql> insert into map_test values 
    -> (('Two Two', point(2,2));
Query OK, 1 row affected (0.00 sec)

mysql> insert into map_test values 
    -> (('Two One', point(2,1));
Query OK, 1 row affected (0.00 sec)

mysql> select name, AsText(loc) from map_test;

+---------+-------------+
| name    | AsText(loc) |
+---------+-------------+
| One Two | POINT(1 2)  |
| Two Two | POINT(2 2)  |
| Two One | POINT(2 1)  |
+---------+-------------+

3 rows in set (0.00 sec)

mysql> SELECT name FROM map_test WHERE
    -> Contains(GeomFromText(
    ->'POLYGON((0 0, 0 3, 3 3, 3 0, 0 0))'
    ->), loc);
+---------+
| name    |
+---------+
| One Two |
| Two Two |
| Two One |
+---------+

3 rows in set (0.00 sec)