仪表上讲的回差是什么意思

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select * from tbl_Articles WHERE ArticleID=144967 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=144967 LIMIT 0,1
select * from tbl_Articles_sphinx where id=144967 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(1734211,1130015,1065331,1073588,1079546,1078134,1070330,1064643,1100623,1727252,1696807,1832451,1085376,1129653,1084563,1972426,994016,1449677,1074892,1299096,1897252,2515961,1057932,1074865,1072683,1378426,1479167,1063151,1554688,1068358) ORDER BY field (ArticleID,1734211,1130015,1065331,1073588,1079546,1078134,1070330,1064643,1100623,1727252,1696807,1832451,1085376,1129653,1084563,1972426,994016,1449677,1074892,1299096,1897252,2515961,1057932,1074865,1072683,1378426,1479167,1063151,1554688,1068358)