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

Last update on January 13 2026 12:20:20 (UTC/GMT +8 hours)

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

Sample table: player_booked

 match_no | team_id | player_id | booking_time | sent_off | play_schedule | play_half
----------+---------+-----------+--------------+----------+---------------+-----------
        1 |    1216 |    160349 |           32 |          | NT            |         1
        1 |    1216 |    160355 |           45 |          | NT            |         1
        1 |    1207 |    160159 |           69 | Y        | NT            |         2
        1 |    1216 |    160360 |           78 |          | NT            |         2
        2 |    1221 |    160470 |           14 |          | NT            |         1
        2 |    1201 |    160013 |           23 |          | NT            |         1
        2 |    1201 |    160013 |           36 |          | NT            |         1
        2 |    1201 |    160014 |           63 |          | NT            |         2
        2 |    1221 |    160472 |           66 |          | NT            |         2
.......
       51 |    1214 |    160302 |          122 |          | ET            |         2

View the table

Sample Solution:

SQL Code:

-- This SQL query calculates the count of rows in the 'player_booked' table where the 'play_schedule' column has the value 'ST'.

SELECT COUNT(*) 
-- COUNT(*) is an aggregate function that counts the number of rows in a result set.
FROM player_booked
-- 'player_booked' is the name of the table being queried.
WHERE play_schedule='ST';
-- The WHERE clause filters rows where the 'play_schedule' column has the value 'ST'.

Sample Output:

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

Code Explanation:

The said query in SQL that determine the number of players who have been booked during stoppage time of a game.
The WHERE clause specifies a condition to filter the rows where the value of "play_schedule" is equal to 'ST'.

Relational Algebra Expression: