秒是最小的时间单位吗

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select * from tbl_Articles WHERE ArticleID=3115244 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=3115244 LIMIT 0,1
select * from tbl_Articles_sphinx where id=3115244 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(1129515,1074916,1102470,1126226,1068222,1046928,1114957,1068708,1123040,1062872,1050369,1044569,994016,1045001,1133443,1044867,1086756,1095508,1129209,1463424,1045111,1049174,1097505,1121385,1695736,999426,1079546,1051075,1128237,1788020) ORDER BY field (ArticleID,1129515,1074916,1102470,1126226,1068222,1046928,1114957,1068708,1123040,1062872,1050369,1044569,994016,1045001,1133443,1044867,1086756,1095508,1129209,1463424,1045111,1049174,1097505,1121385,1695736,999426,1079546,1051075,1128237,1788020)