如何理解存在即意义

页面:/news/view-455474/ | 耗时:0.4073 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=455474 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=455474 LIMIT 0,1
select * from tbl_Articles_sphinx where id=455474 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(1117850,432311,1073820,634414,1130298,1504258,505358,198802,663352,174889,221213,3188624,2858151,1392118,1061242,1065795,1524045,1070088,211355,419526,461434,1129993,1069401,372177,748669,1069557,809302,1126282,1391314,432603) ORDER BY field (ArticleID,1117850,432311,1073820,634414,1130298,1504258,505358,198802,663352,174889,221213,3188624,2858151,1392118,1061242,1065795,1524045,1070088,211355,419526,461434,1129993,1069401,372177,748669,1069557,809302,1126282,1391314,432603)