什么是真子集

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select * from tbl_Articles WHERE ArticleID=197867 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=197867 LIMIT 0,1
select * from tbl_Articles_sphinx where id=197867 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(1072721,1112132,1098277,1068874,1087862,1070474,988780,1111820,1046402,1048034,1063151,1052287,1066812,1069477,1114498,1091267,1071055,1118881,1067880,1083170,1009146,1089450,1076541,1041958,1066810,1078414,1111208,1087191,982939,1118495) ORDER BY field (ArticleID,1072721,1112132,1098277,1068874,1087862,1070474,988780,1111820,1046402,1048034,1063151,1052287,1066812,1069477,1114498,1091267,1071055,1118881,1067880,1083170,1009146,1089450,1076541,1041958,1066810,1078414,1111208,1087191,982939,1118495)