+------------------+---------+
|Column Name |Type|+------------------+---------+
| season_id | int || team_id | int || team_name | varchar || matches_played | int || wins | int || draws | int || losses | int || goals_for | int || goals_against | int |+------------------+---------+
(season_id, team_id) is the uniquekeyfor this table.
This tablecontains season id, team id, team name, matches played, wins, draws, losses, goals scored (goals_for), and goals conceded (goals_against) foreach team ineach season.
Write a solution to calculate the points , goal difference , and
**position **for each team in each season. The position ranking should be determined as follows:
Teams are first ranked by their total points (highest to lowest)
If points are tied, teams are then ranked by their goal difference (highest to lowest)
If goal difference is also tied, teams are then ranked alphabetically by team name
Points are calculated as follows:
3 points for a win
1 point for a draw
0 points for a loss
Goal difference is calculated as: goals_for - goals_against
Return the result table ordered byseason_idinascending order, then by position inascending order, and finally byteam_nameinascending order.
The query result format is in the following example.
Input:
`SeasonStats` table:+------------+---------+-------------------+----------------+------+-------+--------+-----------+---------------+| season_id | team_id | team_name | matches_played | wins | draws | losses | goals_for | goals_against |+------------+---------+-------------------+----------------+------+-------+--------+-----------+---------------+|2021|1| Manchester City |38|29|6|3|99|26||2021|2| Liverpool |38|28|8|2|94|26||2021|3| Chelsea |38|21|11|6|76|33||2021|4| Tottenham |38|22|5|11|69|40||2021|5| Arsenal |38|22|3|13|61|48||2022|1| Manchester City |38|28|5|5|94|33||2022|2| Arsenal |38|26|6|6|88|43||2022|3| Manchester United |38|23|6|9|58|43||2022|4| Newcastle |38|19|14|5|68|33||2022|5| Liverpool |38|19|10|9|75|47|+------------+---------+-------------------+----------------+------+-------+--------+-----------+---------------+Output:
+------------+---------+-------------------+--------+-----------------+----------+| season_id | team_id | team_name | points | goal_difference | position |+------------+---------+-------------------+--------+-----------------+----------+|2021|1| Manchester City |93|73|1||2021|2| Liverpool |92|68|2||2021|3| Chelsea |74|43|3||2021|4| Tottenham |71|29|4||2021|5| Arsenal |69|13|5||2022|1| Manchester City |89|61|1||2022|2| Arsenal |84|45|2||2022|3| Manchester United |75|15|3||2022|4| Newcastle |71|35|4||2022|5| Liverpool |67|28|5|+------------+---------+-------------------+--------+-----------------+----------+Explanation:
* For the 2021 season:* Manchester City has 93points(29*3+6*1) and a goal difference of 73(99-26).* Liverpool has 92points(28*3+8*1) and a goal difference of 68(94-26).* Chelsea has 74points(21*3+11*1) and a goal difference of 43(76-33).* Tottenham has 71points(22*3+5*1) and a goal difference of 29(69-40).* Arsenal has 69points(22*3+3*1) and a goal difference of 13(61-48).* For the 2022 season:* Manchester City has 89points(28*3+5*1) and a goal difference of 61(94-33).* Arsenal has 84points(26*3+6*1) and a goal difference of 45(88-43).* Manchester United has 75points(23*3+6*1) and a goal difference of 15(58-43).* Newcastle has 71points(19*3+14*1) and a goal difference of 35(68-33).* Liverpool has 67points(19*3+10*1) and a goal difference of 28(75-47).* The teams are ranked first by points, then by goal difference, and finally by team name.* The output is ordered by season_id ascending, then by rank ascending, and finally by team_name ascending.
We need to compute points and goal difference for each team in each season, then assign ranks (positions) within each season based on points, goal difference, and team name. SQL window functions (RANK or DENSE_RANK with PARTITION BY) are ideal for this. In pandas, we can use groupby and rank.