Entity Relationship Diagram (ERD)

title {label: "nfldb Entity-Relationship diagram (condensed)", size: "20"}

# Entities

[player] {bgcolor: "#d0e0d0"}
  *player_id {label: "varchar, not null"}
  full_name {label: "varchar, null"}
  team {label: "varchar, not null"}
  position {label: "player_pos, not null"}
  status {label: "player_status, not null"}

[team] {bgcolor: "#d0e0d0"}
  *team_id {label: "varchar, not null"}
  city {label: "varchar, not null"}
  name {label: "varchar, not null"}

[game] {bgcolor: "#ececfc"}
  *gsis_id {label: "gameid, not null"}
  start_time {label: "utctime, not null"}
  week {label: "usmallint, not null"}
  season_year {label: "usmallint, not null"}
  season_type {label: "season_phase, not null"}
  finished {label: "boolean, not null"}
  home_team {label: "varchar, not null"}
  home_score {label: "usmallint, not null"}
  away_team {label: "varchar, not null"}
  away_score {label: "usmallint, not null"}

[drive] {bgcolor: "#ececfc"}
  *+gsis_id {label: "gameid, not null"}
  *drive_id {label: "usmallint, not null"}
  start_field {label: "field_pos, null"}
  start_time {label: "game_time, not null"}
  end_field {label: "field_pos, null"}
  end_time {label: "game_time, not null"}
  pos_team {label: "varchar, not null"}
  pos_time {label: "pos_period, null"}

[play] {bgcolor: "#ececfc"}
  *+gsis_id {label: "gameid, not null"}
  *+drive_id {label: "usmallint, not null"}
  *play_id {label: "usmallint, not null"}
  time {label: "game_time, not null"}
  pos_team {label: "varchar, not null"}
  yardline {label: "field_pos, null"}
  down {label: "smallint, null"}
  yards_to_go {label: "smallint, null"}

[play_player] {bgcolor: "#ececfc"}
  *+gsis_id {label: "gameid, not null"}
  *+drive_id {label: "usmallint, not null"}
  *+play_id {label: "usmallint, not null"}
  *+player_id {label: "varchar, not null"}
  team {label: "varchar, not null"}

[meta] {bgcolor: "#fcecec"}
  version {label: "smallint, null"}
  season_type {label: "season_phase, null"}
  season_year {label: "usmallint, null"}
  week {label: "usmallint, null"}

# Relationships

player      *--1 team
game        *--1 team {label: "home"}
game        *--1 team {label: "away"}
drive       *--1 team
play        *--1 team
play_player *--1 team

game        1--* drive
game        1--* play
game        1--* play_player

drive       1--* play
drive       1--* play_player

play        1--* play_player

player      1--* play_player