请教，优化一个SQL语句！！！

[phf0313]

SELECT 
  u.id
FROM
  user u,
  (SELECT 
    id,
    tree 
  FROM
    user 
  WHERE id IN (30, 59, 58, 57, 56, 60, 61, 62, 63)) a 
WHERE u.tree LIKE CONCAT('1,', a.id) 
ORDER BY u.id ASC 

tree列的数据为：
1
1
1,30
1,59
1,59,100
....

要查出(1,*)的数据，这个SQL要怎么优化?

[ACMAIN_CHM]

创建两个单独的索引
(id)
(tree)

[小小小小蜗牛]

explain
或者 建索引 ，优化

[diffmaker]

SELECT id FROM user WHERE SUBSTR(tree,3,IF(locate(',',tree,3) > 0,locate(',',tree,3)-3,length(tree)-2)) IN (30, 59, 58, 57, 56, 60, 61, 62, 63)

这样可以吗？

[diffmaker]

SELECT id FROM user WHERE LEFT（tree,2)='1,' AND (SUBSTR(tree,3,IF(locate(',',tree,3) > 0,locate(',',tree,3)-3,length(tree)-2))+0) IN (30, 59, 58, 57, 56, 60, 61, 62, 63)

[rucypli]

模糊查询的优化不了

[Rotel-刘志东]

id,tree创建单独索引。