简述左手定则的内容及作用

页面:/news/view-120452/ | 耗时:0.1722 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=120452 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=120452 LIMIT 0,1
select * from tbl_Articles_sphinx where id=120452 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(1121936,1086194,1112004,1107028,1105345,1101783,1114918,1078150,1069159,1087713,1119478,1053074,1055526,1103037,1113349,1088774,1078979,1084139,977420,1051135,1120006,1057545,1098747,1058811,1055149,1107789,1087879,1077112,1104951,1116717) ORDER BY field (ArticleID,1121936,1086194,1112004,1107028,1105345,1101783,1114918,1078150,1069159,1087713,1119478,1053074,1055526,1103037,1113349,1088774,1078979,1084139,977420,1051135,1120006,1057545,1098747,1058811,1055149,1107789,1087879,1077112,1104951,1116717)