什么是栒子树

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select * from tbl_Articles WHERE ArticleID=2738786 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=2738786 LIMIT 0,1
select * from tbl_Articles_sphinx where id=2738786 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(1233723,2886118,1716699,3079848,704432,612782,774497,752649,853741,600471,435588,521331,433418,973837,3489172,1087759,751886,881802,3227505,774239,386023,797869,451273,830685,1203775,1079187,910180,853308,1120867,878446) ORDER BY field (ArticleID,1233723,2886118,1716699,3079848,704432,612782,774497,752649,853741,600471,435588,521331,433418,973837,3489172,1087759,751886,881802,3227505,774239,386023,797869,451273,830685,1203775,1079187,910180,853308,1120867,878446)