﻿ SQL exercises on soccer Database: Compute a list to show the number of substitute happened in various stage of play for the entire tournament - w3resource

# SQL exercises on soccer Database: Compute a list to show the number of substitute happened in various stage of play for the entire tournament

## SQL soccer Database: Basic Exercise-21 with Solution

21. From the following table, write a SQL query to count the number of substitute happened in various stage of play for the entire Tournament. Sort the result-set in ascending order by play-half, play-schedule and number of substitute happened. Return play-half, play-schedule, number of substitute happened.

Sample table: player_in_out

Sample Solution:

``````SELECT play_half,play_schedule,COUNT(*)
FROM player_in_out
WHERE in_out='I'
GROUP BY play_half,play_schedule
ORDER BY play_half,play_schedule,count(*) DESC;
``````

Sample Output:

``` play_half | play_schedule | count
-----------+---------------+-------
1 | ET            |     4
1 | NT            |     3
2 | ET            |     5
2 | NT            |   272
2 | ST            |     9
(5 rows)
```

Relational Algebra Expression:

Relational Algebra Tree:

## Practice Online

Sample Database: soccer

## Query Visualization:

Duration:

Rows:

Cost:

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## SQL: Tips of the Day

Nested select statement in SQL Server.

You need to alias the subquery.

```SELECT name FROM (SELECT name FROM agentinformation) a
```

or to be more explicit

```SELECT a.name FROM (SELECT name FROM agentinformation) a
```

Database: SQL Server

Ref: https://bit.ly/3Qruiu5