SQL Exercise: Find the most number of cards shown in the matches

SQL soccer Database: Joins Exercise-44 with Solution

44. From the following tables, write a SQL query to find the matches in which the most cards are displayed. Return match number, number of cards shown.

Sample table: player_booked

Sample Solution:

SQL Code:

SELECT match_no, Booked FROM (
SELECT match_no,COUNT(*) Booked 
FROM player_booked  
GROUP BY match_no) M1 where Booked=(
SELECT MAX(MX1) 
FROM (SELECT match_no,COUNT(*) MX1 
FROM player_booked  
GROUP BY match_no) M2);

Sample Output:

 match_no | booked 
----------+--------
       51 |     10
(1 row)

Code Explanation:

The said query in SQL that selects the match number and the number of players booked for each match from the table 'player_booked'.
The subquery counts the number of players booked for each match and groups them by the match number.
The outer query selects only those rows where the number of players booked is equal to the maximum number of players booked across all matches. This is done by using a subquery to find the maximum number of players booked (MX1) and then selecting only those rows where the number of players booked is equal to MX1.

Practice Online

Sample Database: soccer

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