营字结构为什么是上中下

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select * from tbl_Articles WHERE ArticleID=2823743 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=2823743 LIMIT 0,1
select * from tbl_Articles_sphinx where id=2823743 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(1080383,1062774,1086762,1073437,1074340,1070997,1075635,981687,1061494,1067115,1077619,1088774,1086582,1062346,1066564,1074748,1083113,1078076,988780,1074670,1133443,1086698,997640,1064533,1078595,993095,1048406,1077569,1081307,1041761) ORDER BY field (ArticleID,1080383,1062774,1086762,1073437,1074340,1070997,1075635,981687,1061494,1067115,1077619,1088774,1086582,1062346,1066564,1074748,1083113,1078076,988780,1074670,1133443,1086698,997640,1064533,1078595,993095,1048406,1077569,1081307,1041761)