什么是单位位置向量

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select * from tbl_Articles WHERE ArticleID=128833 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=128833 LIMIT 0,1
select * from tbl_Articles_sphinx where id=128833 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(1078134,1041629,1062138,1064833,1073041,1114914,1106192,1057607,1063135,1061838,1058958,1063329,1054612,1052599,1072050,1070352,1048158,1096807,1078869,1108307,999794,1100364,1071199,1096751,1010909,1078797,1060887,1107727,1042020,1104824) ORDER BY field (ArticleID,1078134,1041629,1062138,1064833,1073041,1114914,1106192,1057607,1063135,1061838,1058958,1063329,1054612,1052599,1072050,1070352,1048158,1096807,1078869,1108307,999794,1100364,1071199,1096751,1010909,1078797,1060887,1107727,1042020,1104824)