什么是条件反射

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select * from tbl_Articles WHERE ArticleID=1092589 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=1092589 LIMIT 0,1
select * from tbl_Articles_sphinx where id=1092589 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(811548,473274,1066458,405248,680328,464482,453053,392005,516339,645587,2935741,496013,1071517,697459,1076021,694351,1234025,835264,587799,765871,892927,914074,506284,588011,445125,739661,1048726,611922,530233,569382) ORDER BY field (ArticleID,811548,473274,1066458,405248,680328,464482,453053,392005,516339,645587,2935741,496013,1071517,697459,1076021,694351,1234025,835264,587799,765871,892927,914074,506284,588011,445125,739661,1048726,611922,530233,569382)