如何理解光圈

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select * from tbl_Articles WHERE ArticleID=1433195 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=1433195 LIMIT 0,1
select * from tbl_Articles_sphinx where id=1433195 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(1609567,432311,330238,154406,181962,1812589,604733,1500304,402965,255971,1433195,346856,349480,1437211,2683582,1083103,304240,1708054,122577,1063799,612593,402682,649879,232009,1068262,310305,270105,521749,1790541,642972) ORDER BY field (ArticleID,1609567,432311,330238,154406,181962,1812589,604733,1500304,402965,255971,1433195,346856,349480,1437211,2683582,1083103,304240,1708054,122577,1063799,612593,402682,649879,232009,1068262,310305,270105,521749,1790541,642972)