请解释什么是偏摩尔性质

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select * from tbl_Articles WHERE ArticleID=234359 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=234359 LIMIT 0,1
select * from tbl_Articles_sphinx where id=234359 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(1091267,1069833,1102945,1072403,1063151,1080695,1071199,1085906,1064061,1088544,1064663,1106192,1068258,1112871,1110157,1084917,1062999,1120801,1052013,1070050,1064601,1066872,1107022,1109244,1091974,1067901,1070330,1080086,1056798,1097889) ORDER BY field (ArticleID,1091267,1069833,1102945,1072403,1063151,1080695,1071199,1085906,1064061,1088544,1064663,1106192,1068258,1112871,1110157,1084917,1062999,1120801,1052013,1070050,1064601,1066872,1107022,1109244,1091974,1067901,1070330,1080086,1056798,1097889)