前导线的作用

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select * from tbl_Articles WHERE ArticleID=1764160 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=1764160 LIMIT 0,1
select * from tbl_Articles_sphinx where id=1764160 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(965712,3129554,719403,3488941,1060663,2822381,1001590,370054,2710710,2453613,636249,2160436,1116701,1044797,2303337,2942504,3377743,360240,3454802,3228843,1105646,1195501,2472224,968221,1764298,948948,3023144,1985518,1725507,1482289) ORDER BY field (ArticleID,965712,3129554,719403,3488941,1060663,2822381,1001590,370054,2710710,2453613,636249,2160436,1116701,1044797,2303337,2942504,3377743,360240,3454802,3228843,1105646,1195501,2472224,968221,1764298,948948,3023144,1985518,1725507,1482289)