如何理解正念

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select * from tbl_Articles WHERE ArticleID=1837945 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=1837945 LIMIT 0,1
select * from tbl_Articles_sphinx where id=1837945 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(1563292,634414,1408018,277097,1285433,1069401,739250,570239,570199,362256,309011,322372,1079051,980285,269455,1301523,1531608,1112632,317864,565969,1291544,1083030,914683,502573,530126,188537,1754399,198802,1324412,459089) ORDER BY field (ArticleID,1563292,634414,1408018,277097,1285433,1069401,739250,570239,570199,362256,309011,322372,1079051,980285,269455,1301523,1531608,1112632,317864,565969,1291544,1083030,914683,502573,530126,188537,1754399,198802,1324412,459089)