erDiagram
races ||--|| states : "has one"
races ||--|{ horses : "has many"
horses ||--|| jockeys : "has one"
horses {
int id PK
int race_id FK
int jockey_id FK
int frame_number
int arrival
string name
float odds
int popularity
int handicap 斤量
int weight
int age
int sex_id 1: 牡, 2: 牝, 3: セ
}
jockeys {
int id PK
string name
}
races {
string id PK レースID(netkeibaと対応)
int state_id FK
string name
str course
bool is_dart ダートor芝
bool is_right 右回りor左回り
int distance
string weather
}
states {
int id PK
string name
}
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