让步关系是什么意思请举例说明

页面:/news/view-1187182/ | 耗时:0.7393 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=1187182 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=1187182 LIMIT 0,1
select * from tbl_Articles_sphinx where id=1187182 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(420224,492734,1100443,450065,1102306,481950,381865,460406,406821,3135655,392255,1120845,462383,426344,428799,493849,422302,1087623,1113113,457242,463941,1104421,494445,392411,1098497,1094307,1094591,369976,405398,497890) ORDER BY field (ArticleID,420224,492734,1100443,450065,1102306,481950,381865,460406,406821,3135655,392255,1120845,462383,426344,428799,493849,422302,1087623,1113113,457242,463941,1104421,494445,392411,1098497,1094307,1094591,369976,405398,497890)