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SQL Exercise: Total number of players replaced during normal play

SQL soccer Database: Basic Exercise-16 with Solution

16. From the following table, write a SQL query to count the total number of players replaced during normal playtime. 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';

Sample Output:

 Player Replaced
-----------------
             275
(1 row)

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Sample Database: soccer

soccer database relationship structure

Query Visualization:

Duration:

Query visualization of Find the total number of palyers replaced within normal time of play - Duration

Rows:

Query visualization of Find the total number of palyers replaced within normal time of play - Rows

Cost:

Query visualization of Find the total number of palyers replaced within normal time of play - Cost

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