前壁和后壁有什么区别?

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select * from tbl_Articles WHERE ArticleID=3315321 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=3315321 LIMIT 0,1
select * from tbl_Articles_sphinx where id=3315321 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(654490,803609,671987,679078,1053331,1088297,393199,847219,391743,864400,403787,708228,479156,1033837,790019,761871,911706,880216,1172726,888320,586423,655205,557544,1158782,1189165,756329,533261,511425,1089396,762489) ORDER BY field (ArticleID,654490,803609,671987,679078,1053331,1088297,393199,847219,391743,864400,403787,708228,479156,1033837,790019,761871,911706,880216,1172726,888320,586423,655205,557544,1158782,1189165,756329,533261,511425,1089396,762489)