空位是什么意思

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select * from tbl_Articles WHERE ArticleID=3329794 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=3329794 LIMIT 0,1
select * from tbl_Articles_sphinx where id=3329794 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(674223,370917,559941,1690725,3099457,947743,3489560,3464043,382026,388173,682095,571606,981998,2078900,762489,932433,584280,434352,2804442,567798,1023721,470879,2417211,674803,362880,605696,383330,773157,409667,1184596) ORDER BY field (ArticleID,674223,370917,559941,1690725,3099457,947743,3489560,3464043,382026,388173,682095,571606,981998,2078900,762489,932433,584280,434352,2804442,567798,1023721,470879,2417211,674803,362880,605696,383330,773157,409667,1184596)