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SQL Joins exercises on soccer Database: Find the countries from where the referees managed most of the matches

SQL soccer Database: Joins Exercise-50 with Solution

50. From the following tables, write a SQL query to find the countries from where the referees managed most of the matches. Return country name, number of matches.

Sample table: match_mast


Sample table: referee_mast


Sample table: soccer_country


Sample Solution:

SQL Code:

SELECT country_name,
       count(match_no)
FROM match_mast a
JOIN referee_mast c ON a.referee_id=c.referee_id
JOIN soccer_country b ON c.country_id=b.country_id
GROUP BY country_name
HAVING count(match_no)=
  (SELECT max(mm)
   FROM
     (SELECT count(match_no) mm
      FROM match_mast a
      JOIN referee_mast c ON a.referee_id=c.referee_id
      JOIN soccer_country b ON c.country_id=b.country_id
      GROUP BY country_name) hh);

Sample Output:

 country_name | count
--------------+-------
 England      |     7
(1 row)

Practice Online


Sample Database: soccer

soccer database relationship structure

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Previous: From the following tables, write a SQL query to count the number of matches managed by referees of each country. Return country name, number of matches.
Next: From the following tables, write a SQL query to find the number of matches managed by each referee. Return referee name, country name, number of matches.

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SQL: Tips of the Day

SQL Server SELECT into existing table. 

INSERT INTO dbo.TABLETWO
SELECT col1, col2
  FROM dbo.TABLEONE
 WHERE col3 LIKE @search_key

This assumes there's only two columns in dbo.TABLETWO - you need to specify the columns otherwise:

INSERT INTO dbo.TABLETWO
  (col1, col2)
SELECT col1, col2
  FROM dbo.TABLEONE
 WHERE col3 LIKE @search_key

Database: SQL Server

Ref: https://bit.ly/3y6tpA3