SQL Exercise: Name and country of referee who managed the final game
SQL soccer Database: Joins Exercise-9 with Solution
9. From the following tables, write a SQL query to find the referee who managed the final match. Return referee name, country name.
Sample table: soccer_country
Sample table: match_mast
Sample table: referee_mast
SELECT b.referee_name, c.country_name FROM match_mast a NATURAL JOIN referee_mast b NATURAL JOIN soccer_country c WHERE play_stage='F';
referee_name | country_name ------------------+-------------- Mark Clattenburg | England (1 row)
The provided query in SQL that retrieves information about the referee and country for matches in the final stage from the tables match_mast, referee_mast, and soccer_country.
The NATURAL JOIN keyword is used to join the tables based on columns with the same name in the tables match_mast, referee_mast, and soccer_country.
The condition filters the rows only for matches in the final stage, where play_stage is equal to 'F'.
Relational Algebra Expression:
Relational Algebra Tree:
Sample Database: soccer
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Previous SQL Exercise: Name and country of referee who managed the first game.
Next SQL Exercise: Referee who assisted in the opening match.
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