SQL Exercise: Name and country of referee who managed the first game
SQL soccer Database: Joins Exercise-8 with Solution
8. From the following tables, write a SQL query to find the referee who managed the opening 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 match_no=1;
referee_name | country_name ---------------+-------------- Viktor Kassai | Hungary (1 row)
The provided query in SQL that retrieves information about the referee and country for the match with match_no equal to 1 from the tables match_mast, referee_mast, and soccer_country.
The NATURAL JOIN keyword is used to join the tables match_mast, referee_mast, and soccer_country based on columns with the same name in each table.
The condition filters only those rows for the match with match_no equal to 1.
Relational Algebra Expression:
Relational Algebra Tree:
Sample Database: soccer
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Previous SQL Exercise: Find the player who socred first goal of EURO cup 2016.
Next SQL Exercise: Name and country of referee who managed the final game.
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