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SQL Exercise: Find the number of self-goals scored in EURO cup 2016

SQL soccer Database: Basic Exercise-7 with Solution

7. From the following table, write a SQL query to find the number of self-goals scored during the 2016 European Championship.

Sample table: goal_details


Sample Solution:

SELECT COUNT(*) 
FROM goal_details 
WHERE goal_type='O';

Sample Output:

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

Relational Algebra Expression:

Relational Algebra Expression: Find the number of self-goals scored in EURO cup 2016.

Relational Algebra Tree:

Relational Algebra Tree: Find the number of self-goals scored in EURO cup 2016.

Practice Online



Sample Database: soccer

soccer database relationship structure

Query Visualization:

Duration:

Query visualization of Find the number of self-goals scored in EURO cup 2016 - Duration

Rows:

Query visualization of Find the number of self-goals scored in EURO cup 2016 - Rows

Cost:

Query visualization of Find the number of self-goals scored in EURO cup 2016 - Cost

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Previous SQL Exercise: Find the date when did Football EURO cup 2016 begin.
Next SQL Exercise: Number of matches ended with a results in group stage.

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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