请简单解释一下越位规则

页面:/news/view-306712/ | 耗时:0.1341 s | 内存:1.89 MB | 查询:4 | 缓存读取:4 写入:0 | 加载文件:23
select * from tbl_Articles WHERE ArticleID=306712 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=306712 LIMIT 0,1
select * from tbl_Articles_sphinx where id=306712 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(4968322,4904276,4891073,4811116,4806778,4785345,4785333,4753025,4720485,4720481,4720466,4720391,4715783,4695486,4695446,4695335,4695298,4695267,4695243,4695241,4692698,4692687,4692610,4692586,4692567,4681332,4681286,4681243,4668072,4668055) ORDER BY field (ArticleID,4968322,4904276,4891073,4811116,4806778,4785345,4785333,4753025,4720485,4720481,4720466,4720391,4715783,4695486,4695446,4695335,4695298,4695267,4695243,4695241,4692698,4692687,4692610,4692586,4692567,4681332,4681286,4681243,4668072,4668055)