group_concat([DISTINCT] 要鏈接的字段 [Order BY ASC/DESC 排序字段] [Separator '分隔符'])排序
SELECT id,GROUP_CONCAT(score) FROM testgroup GROUP BY id;test
SELECT id,GROUP_CONCAT(DISTINCT score) FROM testgroup GROUP BY id;co
SELECT id,GROUP_CONCAT(score ORDER BY score DESC) FROM testgroup GROUP BY id;
SELECT id,GROUP_CONCAT(score SEPARATOR ';') FROM testgroup GROUP BY id;