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SQL Exercise: Matches, goalless draws in group stage matches

SQL soccer Database: Basic Exercise-13 with Solution

13. From the following table, write a SQL query to count the number of matches that ended in a goalless draw at the group stage. Return number of matches.

Sample table: match_details


Sample Solution:

SELECT COUNT(DISTINCT(match_no))
FROM match_details
WHERE win_lose='D' 
AND goal_score=0 AND play_stage='G';

Sample Output:

 count
-------
     4
(1 row)

Relational Algebra Expression:

Relational Algebra Expression: Find the number of matches ending with a goalless draw in group stage of play.

Relational Algebra Tree:

Relational Algebra Tree: Find the number of matches ending with a goalless draw in group stage of play.

Practice Online



Sample Database: soccer

soccer database relationship structure

Query Visualization:

Duration:

Query visualization of Find the number of matches ending with a goalless draw in group stage of play - Duration

Rows:

Query visualization of Find the number of matches ending with a goalless draw in group stage of play - Rows

Cost:

Query visualization of Find the number of matches ending with a goalless draw in group stage of play - Cost

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Previous SQL Exercise: Matches, first half with no stoppage time added.
Next SQL Exercise: Matches, one goal wins except decided by penalty kicks.

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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