考试时应注意哪些问题

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select * from tbl_Articles WHERE ArticleID=3186241 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=3186241 LIMIT 0,1
select * from tbl_Articles_sphinx where id=3186241 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(2941308,1122723,2133524,1127463,256936,1315215,2120785,171968,304721,2745294,1354279,1071941,302818,1106288,266052,2463318,2940591,1603056,1464914,3105497,1058215,513332,1074306,2601777,2429054,3186241,2477469,1917405,512439,260707) ORDER BY field (ArticleID,2941308,1122723,2133524,1127463,256936,1315215,2120785,171968,304721,2745294,1354279,1071941,302818,1106288,266052,2463318,2940591,1603056,1464914,3105497,1058215,513332,1074306,2601777,2429054,3186241,2477469,1917405,512439,260707)