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楼上的解答很赞，你的这个需要应该是需要用到条件查询 case when then else end…

SELECT
    pid,
    uid,
    SUM( score ) AS score,
    MAX( created_at ) AS created_at,
    SUM( CASE WHEN type = 1 THEN score ELSE 0 END ) AS type1,
    SUM( CASE WHEN type = 2 THEN score ELSE 0 END ) AS type2,
    SUM( CASE WHEN type = 3 THEN score ELSE 0 END ) AS type3,
    SUM( CASE WHEN type = 4 THEN score ELSE 0 END ) AS type4
FROM
    demo_x
GROUP BY
    uid

亲测有效

SELECT
    MAX( uid ) uid,
    MAX( pid ) pid,
    SUM( score ) score,
    SUM( CASE WHEN type = 1 THEN score ELSE 0 END ) type1,
    SUM( CASE WHEN type = 2 THEN score ELSE 0 END ) type2,
    SUM( CASE WHEN type = 3 THEN score ELSE 0 END ) type3,
    MAX( created_at ) created_at 
FROM
    table 
GROUP BY
    uid

看一下是否符合你的要求。

用sql麻烦的吧。 用php逻辑组合要方便得多吧