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SQL Exercise: Number of matches got a result by penalty shootout

SQL soccer Database: Basic Exercise-9 with Solution

9. From the following table, write a SQL query to find the number of matches that resulted in a penalty shootout.

Sample table: penalty_shootout


Sample Solution:

SELECT COUNT(DISTINCT match_no) 
FROM penalty_shootout;

Sample Output:

 count
-------
     3
(1 row)

Relational Algebra Expression:

Relational Algebra Expression: Find the number of matches got a result by penalty shootout.

Relational Algebra Tree:

Relational Algebra Tree: Find the number of matches got a result by penalty shootout.

Practice Online



Sample Database: soccer

soccer database relationship structure

Query Visualization:

Duration:

Query visualization of Find the number of matches got a result by penalty shootout - Duration

Rows:

Query visualization of Find the number of matches got a result by penalty shootout - Rows

Cost:

Query visualization of Find the number of matches got a result by penalty shootout - Cost

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Previous SQL Exercise: Number of matches ended with a results in group stage.
Next SQL Exercise: Matches decided by penalties in the Round of 16.

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SQL: Tips of the Day

Can a foreign key be NULL and/or duplicate?

First remember a Foreign key simply requires that the value in that field must exist first in a different table (the parent table). That is all an Foreign key is by definition. Null by definition is not a value. Null means that we do not yet know what the value is.

Ref: https://bit.ly/3uVu3OS