比秒还小的时间单位是什么

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select * from tbl_Articles WHERE ArticleID=1748635 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=1748635 LIMIT 0,1
select * from tbl_Articles_sphinx where id=1748635 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(1083249,1109799,1092886,1067017,1078599,1102710,1113471,1328815,1077569,1087693,1067027,1110608,1113507,1109607,1099175,1075635,1052073,1063315,1078076,1057674,1087825,1042765,1063467,1087191,2451048,2710003,1092127,1105557,1065729,1078438) ORDER BY field (ArticleID,1083249,1109799,1092886,1067017,1078599,1102710,1113471,1328815,1077569,1087693,1067027,1110608,1113507,1109607,1099175,1075635,1052073,1063315,1078076,1057674,1087825,1042765,1063467,1087191,2451048,2710003,1092127,1105557,1065729,1078438)