cover什么意思

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select * from tbl_Articles WHERE ArticleID=392385 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=392385 LIMIT 0,1
select * from tbl_Articles_sphinx where id=392385 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(365666,418731,450772,419117,466459,1104171,1609714,365896,372038,1115406,393942,419980,1297353,428799,1090613,403399,369976,429595,436290,1119542,1090438,394098,379518,389797,417020,420985,414580,1122701,1122603,79987) ORDER BY field (ArticleID,365666,418731,450772,419117,466459,1104171,1609714,365896,372038,1115406,393942,419980,1297353,428799,1090613,403399,369976,429595,436290,1119542,1090438,394098,379518,389797,417020,420985,414580,1122701,1122603,79987)