什么是等式的基本性质

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select * from tbl_Articles WHERE ArticleID=276007 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=276007 LIMIT 0,1
select * from tbl_Articles_sphinx where id=276007 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(1073515,1090032,1046706,1053404,1099819,1065331,1068532,1074630,1118134,1102438,2951980,1464931,1096793,1055866,1080817,1060875,1075526,1123739,1080441,1088451,2811177,1049062,1103540,1116669,1117580,1074820,1086408,999794,1121385,1128765) ORDER BY field (ArticleID,1073515,1090032,1046706,1053404,1099819,1065331,1068532,1074630,1118134,1102438,2951980,1464931,1096793,1055866,1080817,1060875,1075526,1123739,1080441,1088451,2811177,1049062,1103540,1116669,1117580,1074820,1086408,999794,1121385,1128765)