实体集之间的联系有哪三种类型

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select * from tbl_Articles WHERE ArticleID=2537049 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=2537049 LIMIT 0,1
select * from tbl_Articles_sphinx where id=2537049 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(1131887,1089263,1096739,1062062,1086408,1063671,1049440,1129661,1087543,1094607,1079956,1091097,1077742,1070534,1069389,1129549,1069637,1093342,1088694,1081869,1091442,1071195,1041849,1062350,1046772,1082962,1093641,1090541,977420,1122583) ORDER BY field (ArticleID,1131887,1089263,1096739,1062062,1086408,1063671,1049440,1129661,1087543,1094607,1079956,1091097,1077742,1070534,1069389,1129549,1069637,1093342,1088694,1081869,1091442,1071195,1041849,1062350,1046772,1082962,1093641,1090541,977420,1122583)