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SQL Exercise: Number of matches ended with a results in group stage

SQL soccer Database: Basic Exercise-8 with Solution

8. From the following table, write a SQL query to count the number of matches ended with a results in-group stage.

Sample table: match_mast


Sample Solution:

SELECT COUNT(*) 
FROM match_mast 
WHERE results='WIN' 
AND play_stage='G';

Sample Output:

 count
-------
    25
(1 row)

Relational Algebra Expression:

Relational Algebra Expression: Count the number of matches ended with a results in group stage.

Relational Algebra Tree:

Relational Algebra Tree: Count the number of matches ended with a results in group stage.

Practice Online



Sample Database: soccer

soccer database relationship structure

Query Visualization:

Duration:

Query visualization of Count the number of matches ended with a results in group stage - Duration

Rows:

Query visualization of Count the number of matches ended with a results in group stage - Rows

Cost:

Query visualization of Count the number of matches ended with a results in group stage - Cost

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Previous SQL Exercise: Find the number of self-goals scored in EURO cup 2016.
Next SQL Exercise: Number of matches got a result by penalty shootout.

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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