练有哪几种意思

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select * from tbl_Articles WHERE ArticleID=513600 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=513600 LIMIT 0,1
select * from tbl_Articles_sphinx where id=513600 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(1051403,1050369,1077944,1070614,1071992,1104591,1067933,1054674,1076277,1068937,1067795,1088924,1076059,1049014,1075684,1079840,1086756,1072901,1078076,1073577,1064531,1041639,1080801,1065107,1075714,1097801,1069743,996794,1067905,1086446) ORDER BY field (ArticleID,1051403,1050369,1077944,1070614,1071992,1104591,1067933,1054674,1076277,1068937,1067795,1088924,1076059,1049014,1075684,1079840,1086756,1072901,1078076,1073577,1064531,1041639,1080801,1065107,1075714,1097801,1069743,996794,1067905,1086446)