SQL Exercise: Referee who assisted in the opening match
SQL soccer Database: Joins Exercise-10 with Solution
10. From the following tables, write a SQL query to find the referee who assisted the referee in the opening match. Return associated referee name, country name.
Sample table: asst_referee_mast
Sample table: soccer_country
Sample table: match_details
Sample Solution:
SQL Code:
SELECT ass_ref_name, country_name
FROM asst_referee_mast a
JOIN soccer_country b
ON a.country_id=b.country_id
JOIN match_details c
ON a.ass_ref_id=c.ass_ref
WHERE match_no=1;
Sample Output:
ass_ref_name | country_name --------------+-------------- Gyorgy Ring | Hungary Vencel Toth | Hungary (2 rows)
Code Explanation:
The said query in SQL that retrieves information about the assistant referee and country for the match with match_no equal to 1 from the tables asst_referee_mast, soccer_country, and match_details.
The JOIN keyword is used to join the tables based on columns specified in the ON clause. The asst_referee_mast and soccer_country are joined on the country_id column, while asst_referee_mast and match_details are joined on the ass_ref_id column.
The condition filters only those rows for the match with match_no equal to 1 will be selected.
Relational Algebra Expression:
Relational Algebra Tree:
Practice Online
Sample Database: soccer

Query Visualization:
Duration:

Rows:

Cost:

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Previous SQL Exercise: Name and country of referee who managed the final game.
Next SQL Exercise: Referee who assisted in the final match.
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SELECT * FROM ( SELECT ROW_NUMBER() OVER ( ORDER BY OrderDate ) AS RowNum, * FROM Orders WHERE OrderDate >= '1980-01-01' ) AS RowConstrainedResult WHERE RowNum >= 1 AND RowNum < 20 ORDER BY RowNum
Database: SQL Server
Ref: https://bit.ly/3MGrNlk
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