如何判定级数的发散性

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select * from tbl_Articles WHERE ArticleID=1123336 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=1123336 LIMIT 0,1
select * from tbl_Articles_sphinx where id=1123336 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(86695,1113904,100649,753949,1189477,2827822,361817,1653408,359864,698634,3205254,3136381,3374357,86022,164839,660950,1096128,1001506,1231499,1108854,1194749,3400068,3471202,362413,1967147,1136061,362435,2778629,1101627,899032) ORDER BY field (ArticleID,86695,1113904,100649,753949,1189477,2827822,361817,1653408,359864,698634,3205254,3136381,3374357,86022,164839,660950,1096128,1001506,1231499,1108854,1194749,3400068,3471202,362413,1967147,1136061,362435,2778629,1101627,899032)