请问如何理解极限的精确定义

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select * from tbl_Articles WHERE ArticleID=232069 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=232069 LIMIT 0,1
select * from tbl_Articles_sphinx where id=232069 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(1085372,1085616,1097635,1111326,1093657,1106078,1114128,1101921,1049542,1074298,1097667,1065713,1089962,1091625,1095724,1069389,1110620,905945,1074851,1105029,1052952,1099075,1066106,1090937,1042815,1064449,1113337,1045901,1083113,1098747) ORDER BY field (ArticleID,1085372,1085616,1097635,1111326,1093657,1106078,1114128,1101921,1049542,1074298,1097667,1065713,1089962,1091625,1095724,1069389,1110620,905945,1074851,1105029,1052952,1099075,1066106,1090937,1042815,1064449,1113337,1045901,1083113,1098747)