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.

echo $($PSQL "TRUNCATE year,round,winner,opponent,winner_goals,opponent_goals")
cat games.csv | while IFS="," read YEAR ROUND WINNER OPPONENT WINNER_GOALS OPPONENT_GOALS
do
  if [[ $YEAR != "year" ]]
  then
    #get opponent team id
    OPPONENT_ID=$($PSQL "SELECT team_id FROM teams WHERE name='$OPPONENT'")
    if [[ -z $OPPONENT_ID ]]
    then
      #insert team
      INSERT_TEAM=$($PSQL"INSERT INTO teams(name) VALUES('$OPPONENT');")
      echo Insertion a new team name:$NAME
      OPPONENT_ID=$($PSQL "SELECT team_id FROM teams WHERE name='$OPPONENT'")
    fi
    #get winner team id
    WINNER_ID=$($PSQL "SELECT team_id FROM teams WHERE name='$WINNER'")
    if [[ -z $WINNER_ID ]]
    then
      #insert team
      INSERT_TEAM=$($PSQL"INSERT INTO teams(name) VALUES('$WINNER');")
      echo Insertion a new team name:$NAME
      WINNER_ID=$($PSQL "SELECT team_id FROM teams WHERE name='$WINNER'")
    fi

    #insert games
    INSERT_GAMES=$($PSQL "INSERT INTO games(year, round, winner_id, opponent_id, winner_goals, opponent_goals) VALUES($YEAR, '$ROUND', $WINNER_ID, $OPPONENT_ID, $WINNER_GOALS, $OPPONENT_GOALS);")
    echo Insertion a new game
  fi
done