SQL Exercise: Total number of goalless draws in the tournament
SQL soccer Database: Basic Exercise-19 with Solution
19. From the following table, write a SQL query to count the total number of goalless draws played in the entire tournament. Return number of goalless draws.
Sample table: match_details
Sample Solution:
SELECT COUNT(DISTINCT match_no)
FROM match_details
WHERE win_lose='D'
AND goal_score=0;
Sample Output:
count ------- 4 (1 row)
Relational Algebra Expression:

Relational Algebra Tree:

Practice Online
Sample Database: soccer

Query Visualization:
Duration:

Rows:

Cost:

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Previous SQL Exercise: Number of players replaced in the first half of play.
Next SQL Exercise: Number of players replaced in the extra time of play.
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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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