fcc - certification - relational database - worldcup

insert_data.sh

#! /bin/bash

if [[ $1 == "test" ]]
then
  PSQL="psql --username=postgres --dbname=worldcuptest -t --no-align -c"
else
  PSQL="psql --username=freecodecamp --dbname=worldcup -t --no-align -c"
fi

# Do not change code above this line. Use the PSQL variable above to query your database.

declare -A team_to_id
val_doesnt_matter=1

while IFS="," read -r year round winner opponent winner_goals opponent_goals; do
  [[ -z $year ]] && continue # skip empty row
  team_to_id[$winner]="$val_doesnt_matter"
  team_to_id[$opponent]="$val_doesnt_matter"
done < <(tail -n +2 games.csv)

###

$PSQL "truncate teams, games" > /dev/null
$PSQL "alter sequence teams_team_id_seq restart;" > /dev/null
$PSQL "alter sequence games_game_id_seq restart;" > /dev/null

# bulk insert to teams
insert_teams_val=""
for team in "${!team_to_id[@]}"; do
  insert_teams_val="${insert_teams_val}, ('${team}')"
done
insert_teams_val=$(echo $insert_teams_val | sed -r 's/^, //')
insert_teams_sql="insert into teams (name) values ${insert_teams_val};"
$PSQL "$insert_teams_sql" > /dev/null

# slurp all team ids into $team_to_id
teams=$($PSQL "select * from teams;")
while IFS="|" read -r team_id team_name; do
  team_to_id["${team_name}"]="${team_id}"
done <<< "$(echo -e "$teams")"

# bulk insert to games 
insert_games_val=""
while IFS="," read -r year round winner opponent winner_goals opponent_goals; do
  [[ -z $year ]] && continue # skip empty row
  winner_id="${team_to_id[$winner]}"
  opponent_id="${team_to_id[$opponent]}"
  insert_games_val="${insert_games_val}, ($year, '$round', $winner_id, $opponent_id, $winner_goals, $opponent_goals)"
done < <(tail -n +2 games.csv)
insert_games_val=$(echo $insert_games_val | sed -r 's/^, //')
insert_games_sql="insert into games (year, round, winner_id, opponent_id, winner_goals, opponent_goals) values ${insert_games_val};"
$PSQL "$insert_games_sql" > /dev/null

queries.sh

#! /bin/bash

PSQL="psql --username=freecodecamp --dbname=worldcup --no-align --tuples-only -c"

# Do not change code above this line. Use the PSQL variable above to query your database.

echo -e "\nTotal number of goals in all games from winning teams:"
echo "$($PSQL "SELECT SUM(winner_goals) FROM games;")"

echo -e "\nTotal number of goals in all games from both teams combined:"
echo "$($PSQL "SELECT SUM(winner_goals + opponent_goals) FROM games;")"

echo -e "\nAverage number of goals in all games from the winning teams:"
echo "$($PSQL "SELECT AVG(winner_goals) FROM games;")"

echo -e "\nAverage number of goals in all games from the winning teams rounded to two decimal places:"
echo "$($PSQL "SELECT ROUND(AVG(winner_goals), 2) FROM games;")"

echo -e "\nAverage number of goals in all games from both teams:"
echo "$($PSQL "SELECT AVG(winner_goals + opponent_goals) FROM games;")"

echo -e "\nMost goals scored in a single game by one team:"
echo "$($PSQL "SELECT greatest(MAX(winner_goals), MAX(opponent_goals)) FROM games;")"

echo -e "\nNumber of games where the winning team scored more than two goals:"
echo "$($PSQL "select count(*) from games where winner_goals > 2;")"

echo -e "\nWinner of the 2018 tournament team name:"
echo "$($PSQL "select name from teams inner join games on games.winner_id = teams.team_id where year = 2018 and round = 'Final';")"

echo -e "\nList of teams who played in the 2014 'Eighth-Final' round:"
echo "$($PSQL "select distinct name from teams inner join games on team_id in (winner_id, opponent_id) where year = 2014 and round = 'Eighth-Final' order by name;")"

echo -e "\nList of unique winning team names in the whole data set:"
echo "$($PSQL "select distinct name from teams inner join games on team_id = winner_id order by name;")"

echo -e "\nYear and team name of all the champions:"
echo "$($PSQL "select year, name from teams inner join games on team_id = winner_id where round = 'Final' order by year;")"

echo -e "\nList of teams that start with 'Co':"
echo "$($PSQL "select name from teams where name ilike 'Co%' order by name;")"
echo ""

worldcup.sql

--
-- PostgreSQL database dump
--

-- Dumped from database version 12.22 (Ubuntu 12.22-0ubuntu0.20.04.4)
-- Dumped by pg_dump version 12.22 (Ubuntu 12.22-0ubuntu0.20.04.4)

SET statement_timeout = 0;
SET lock_timeout = 0;
SET idle_in_transaction_session_timeout = 0;
SET client_encoding = 'UTF8';
SET standard_conforming_strings = on;
SELECT pg_catalog.set_config('search_path', '', false);
SET check_function_bodies = false;
SET xmloption = content;
SET client_min_messages = warning;
SET row_security = off;

DROP DATABASE worldcup;
--
-- Name: worldcup; Type: DATABASE; Schema: -; Owner: freecodecamp
--

CREATE DATABASE worldcup WITH TEMPLATE = template0 ENCODING = 'UTF8' LC_COLLATE = 'C.UTF-8' LC_CTYPE = 'C.UTF-8';


ALTER DATABASE worldcup OWNER TO freecodecamp;

\connect worldcup

SET statement_timeout = 0;
SET lock_timeout = 0;
SET idle_in_transaction_session_timeout = 0;
SET client_encoding = 'UTF8';
SET standard_conforming_strings = on;
SELECT pg_catalog.set_config('search_path', '', false);
SET check_function_bodies = false;
SET xmloption = content;
SET client_min_messages = warning;
SET row_security = off;

SET default_tablespace = '';

SET default_table_access_method = heap;

--
-- Name: games; Type: TABLE; Schema: public; Owner: freecodecamp
--

CREATE TABLE public.games (
    game_id integer NOT NULL,
    year integer NOT NULL,
    round character varying(30) NOT NULL,
    winner_id integer NOT NULL,
    opponent_id integer NOT NULL,
    winner_goals integer NOT NULL,
    opponent_goals integer NOT NULL
);


ALTER TABLE public.games OWNER TO freecodecamp;

--
-- Name: games_game_id_seq; Type: SEQUENCE; Schema: public; Owner: freecodecamp
--

CREATE SEQUENCE public.games_game_id_seq
    AS integer
    START WITH 1
    INCREMENT BY 1
    NO MINVALUE
    NO MAXVALUE
    CACHE 1;


ALTER TABLE public.games_game_id_seq OWNER TO freecodecamp;

--
-- Name: games_game_id_seq; Type: SEQUENCE OWNED BY; Schema: public; Owner: freecodecamp
--

ALTER SEQUENCE public.games_game_id_seq OWNED BY public.games.game_id;


--
-- Name: teams; Type: TABLE; Schema: public; Owner: freecodecamp
--

CREATE TABLE public.teams (
    team_id integer NOT NULL,
    name character varying(50) NOT NULL
);


ALTER TABLE public.teams OWNER TO freecodecamp;

--
-- Name: teams_team_id_seq; Type: SEQUENCE; Schema: public; Owner: freecodecamp
--

CREATE SEQUENCE public.teams_team_id_seq
    AS integer
    START WITH 1
    INCREMENT BY 1
    NO MINVALUE
    NO MAXVALUE
    CACHE 1;


ALTER TABLE public.teams_team_id_seq OWNER TO freecodecamp;

--
-- Name: teams_team_id_seq; Type: SEQUENCE OWNED BY; Schema: public; Owner: freecodecamp
--

ALTER SEQUENCE public.teams_team_id_seq OWNED BY public.teams.team_id;


--
-- Name: games game_id; Type: DEFAULT; Schema: public; Owner: freecodecamp
--

ALTER TABLE ONLY public.games ALTER COLUMN game_id SET DEFAULT nextval('public.games_game_id_seq'::regclass);


--
-- Name: teams team_id; Type: DEFAULT; Schema: public; Owner: freecodecamp
--

ALTER TABLE ONLY public.teams ALTER COLUMN team_id SET DEFAULT nextval('public.teams_team_id_seq'::regclass);


--
-- Data for Name: games; Type: TABLE DATA; Schema: public; Owner: freecodecamp
--



--
-- Data for Name: teams; Type: TABLE DATA; Schema: public; Owner: freecodecamp
--



--
-- Name: games_game_id_seq; Type: SEQUENCE SET; Schema: public; Owner: freecodecamp
--

SELECT pg_catalog.setval('public.games_game_id_seq', 1, false);


--
-- Name: teams_team_id_seq; Type: SEQUENCE SET; Schema: public; Owner: freecodecamp
--

SELECT pg_catalog.setval('public.teams_team_id_seq', 1, false);


--
-- Name: games games_pkey; Type: CONSTRAINT; Schema: public; Owner: freecodecamp
--

ALTER TABLE ONLY public.games
    ADD CONSTRAINT games_pkey PRIMARY KEY (game_id);


--
-- Name: teams teams_name_key; Type: CONSTRAINT; Schema: public; Owner: freecodecamp
--

ALTER TABLE ONLY public.teams
    ADD CONSTRAINT teams_name_key UNIQUE (name);


--
-- Name: teams teams_pkey; Type: CONSTRAINT; Schema: public; Owner: freecodecamp
--

ALTER TABLE ONLY public.teams
    ADD CONSTRAINT teams_pkey PRIMARY KEY (team_id);


--
-- Name: games games_opponent_id_fkey; Type: FK CONSTRAINT; Schema: public; Owner: freecodecamp
--

ALTER TABLE ONLY public.games
    ADD CONSTRAINT games_opponent_id_fkey FOREIGN KEY (opponent_id) REFERENCES public.teams(team_id);


--
-- Name: games games_winner_id_fkey; Type: FK CONSTRAINT; Schema: public; Owner: freecodecamp
--

ALTER TABLE ONLY public.games
    ADD CONSTRAINT games_winner_id_fkey FOREIGN KEY (winner_id) REFERENCES public.teams(team_id);


--
-- PostgreSQL database dump complete
--