子网前缀长度是什么

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select * from tbl_Articles WHERE ArticleID=3388491 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=3388491 LIMIT 0,1
select * from tbl_Articles_sphinx where id=3388491 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(1097001,1105379,2642235,391559,1103720,100526,399457,396551,387638,1098377,366873,1107527,1665464,412270,1089594,371879,406233,389005,394930,407610,1105932,388179,365712,387812,381122,86754,363633,1879474,405296,377267) ORDER BY field (ArticleID,1097001,1105379,2642235,391559,1103720,100526,399457,396551,387638,1098377,366873,1107527,1665464,412270,1089594,371879,406233,389005,394930,407610,1105932,388179,365712,387812,381122,86754,363633,1879474,405296,377267)