如何计算整数平方根

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select * from tbl_Articles WHERE ArticleID=2892803 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=2892803 LIMIT 0,1
select * from tbl_Articles_sphinx where id=2892803 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(1362143,1451856,2688922,2404075,1073820,2408826,705650,980285,515499,153870,894518,2913267,426241,2152241,1079426,2805308,527203,1068264,1043361,1099271,1062130,1328795,2180375,2029783,1771421,3321846,1498842,1337168,143997,1044569) ORDER BY field (ArticleID,1362143,1451856,2688922,2404075,1073820,2408826,705650,980285,515499,153870,894518,2913267,426241,2152241,1079426,2805308,527203,1068264,1043361,1099271,1062130,1328795,2180375,2029783,1771421,3321846,1498842,1337168,143997,1044569)