什么是限界基本限界分为那几种

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select * from tbl_Articles WHERE ArticleID=2415405 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=2415405 LIMIT 0,1
select * from tbl_Articles_sphinx where id=2415405 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(1092053,1064613,1108307,1093897,1076764,1073407,1099223,1069083,1079950,1102310,1107727,1079890,1077370,1073100,1111130,1070922,1086120,1076786,1070474,1050439,1078102,1102466,1092315,1045911,1110730,1066622,1067627,1103741,1089560,1076490) ORDER BY field (ArticleID,1092053,1064613,1108307,1093897,1076764,1073407,1099223,1069083,1079950,1102310,1107727,1079890,1077370,1073100,1111130,1070922,1086120,1076786,1070474,1050439,1078102,1102466,1092315,1045911,1110730,1066622,1067627,1103741,1089560,1076490)