什么是长尾关键词

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select * from tbl_Articles WHERE ArticleID=604942 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=604942 LIMIT 0,1
select * from tbl_Articles_sphinx where id=604942 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(2622255,449591,2577675,2699165,2040194,1092373,1018076,1774227,1094371,1116067,809049,2373985,1297353,3111232,1175273,2862907,1102516,1411644,2468485,1761679,2606502,1114910,1116579,1104421,1104739,79985,1921968,1114676,1064232,1104491) ORDER BY field (ArticleID,2622255,449591,2577675,2699165,2040194,1092373,1018076,1774227,1094371,1116067,809049,2373985,1297353,3111232,1175273,2862907,1102516,1411644,2468485,1761679,2606502,1114910,1116579,1104421,1104739,79985,1921968,1114676,1064232,1104491)