次级键包括哪些

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select * from tbl_Articles WHERE ArticleID=694552 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=694552 LIMIT 0,1
select * from tbl_Articles_sphinx where id=694552 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(1204679,1156689,3492111,457303,3485608,901493,905344,2655587,3320994,484359,1614900,1440300,1173791,2779932,1075023,1610948,850535,1118255,3392202,3272588,3453558,2733380,1086965,782203,465586,756763,1062233,3460771,1559668,1012709) ORDER BY field (ArticleID,1204679,1156689,3492111,457303,3485608,901493,905344,2655587,3320994,484359,1614900,1440300,1173791,2779932,1075023,1610948,850535,1118255,3392202,3272588,3453558,2733380,1086965,782203,465586,756763,1062233,3460771,1559668,1012709)