SQL Exercise: Find the number of venues for EURO cup 2016
SQL soccer Database: Basic Exercise-1 with Solution
1. From the following table, write a SQL query to count the number of venues for EURO cup 2016. Return number of venues.
Sample table: soccer_venue
Sample Solution:
SELECT COUNT(*)
FROM soccer_venue;
Sample Output:
count ------- 10 (1 row)
Relational Algebra Expression:

Relational Algebra Tree:

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Sample Database: soccer

Query Visualization:
Duration:

Rows:

Cost:

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Previous SQL Exercise: SQL Basic Exercises on Soccer Database
Next SQL Exercise: Number of countries participated in the EURO cup 2016.
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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
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