什么叫等价集合

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select * from tbl_Articles WHERE ArticleID=195871 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=195871 LIMIT 0,1
select * from tbl_Articles_sphinx where id=195871 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(1078102,1074409,1065683,1086458,1081611,1080997,1072809,1028715,1047285,987401,1063213,1088572,1062494,1083419,1086580,1080171,1063165,1077268,1056968,1062696,1068330,1078438,1124217,1083170,1076537,1086514,1064061,1087833,1068874,1080717) ORDER BY field (ArticleID,1078102,1074409,1065683,1086458,1081611,1080997,1072809,1028715,1047285,987401,1063213,1088572,1062494,1083419,1086580,1080171,1063165,1077268,1056968,1062696,1068330,1078438,1124217,1083170,1076537,1086514,1064061,1087833,1068874,1080717)