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SQL Exercise: Number of players replaced in the first half of play

SQL soccer Database: Basic Exercise-18 with Solution

18. From the following table, write a SQL query to count the number of players who were replaced during the first half. Return number of players as "Player Replaced".

Sample table: player_in_out


Sample Solution:

SELECT COUNT(*) as "Player Replaced"
FROM player_in_out
WHERE in_out='I'
AND play_schedule='NT'
AND play_half=1;

Sample Output:

 Player Replaced
-----------------
               3
(1 row)

Practice Online



Sample Database: soccer

soccer database relationship structure

Query Visualization:

Duration:

Query visualization of Find the total number of players replaced in the first half of play - Duration

Rows:

Query visualization of Find the total number of players replaced in the first half of play - Rows

Cost:

Query visualization of Find the total number of players replaced in the first half of play - Cost

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Previous SQL Exercise: Number of players replaced in the stoppage time.
Next SQL Exercise: Total number of goalless draws in the tournament.

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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