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SQL Exercise: Find the number of booking happened in stoppage time

SQL soccer Database: Exercise-28 with Solution

28. From the following table, write a SQL query to count the number of bookings during stoppage time.

Sample table: player_booked


Sample Solution:

SQL Code:

SELECT COUNT(*) 
FROM player_booked
WHERE play_schedule='ST';

Sample Output:

 count
-------
    10
(1 row)

Relational Algebra Expression:

Relational Algebra Expression: Find the number of booking happened in stoppage time.

Relational Algebra Tree:

Relational Algebra Tree: Find the number of booking happened in stoppage time.

Practice Online


Sample Database: soccer

soccer database relationship structure

Query Visualization:

Duration:

Query visualization of Find the number of booking happened in stoppage time - Duration

Rows:

Query visualization of Find the number of booking happened in stoppage time - Rows

Cost:

Query visualization of Find the number of booking happened in stoppage time - Cost

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Previous SQL Exercise: Within each half of play, find the number of bookings.
Next SQL Exercise: Find the number of booking happened in extra time.

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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