里格是一种怎样的长度单位

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select * from tbl_Articles WHERE ArticleID=3163660 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=3163660 LIMIT 0,1
select * from tbl_Articles_sphinx where id=3163660 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(1128777,1055361,1048494,1061928,1116703,1070993,1068774,1058085,1086338,1089454,1060721,1084471,1082363,1049870,1096527,1129329,1118505,1057028,1110870,1078332,1098893,1054136,1071701,1899230,1042893,1052073,1114784,2472313,1128223,3192219) ORDER BY field (ArticleID,1128777,1055361,1048494,1061928,1116703,1070993,1068774,1058085,1086338,1089454,1060721,1084471,1082363,1049870,1096527,1129329,1118505,1057028,1110870,1078332,1098893,1054136,1071701,1899230,1042893,1052073,1114784,2472313,1128223,3192219)