﻿ SQL: Display the average price of the items for each company - w3resource

# SQL: Display the average price of the items for each company

## SQL Basic Select Statement: Exercise-29 with Solution.

From the following table, write a SQL query to calculate average price of the items for each company. Return average price and company code.

Sample table: item_mast

Sample Solution:

``````SELECT AVG(pro_price), pro_com
FROM item_mast
GROUP BY pro_com;
``````

Output of the Query:

```avg					pro_com
250.0000000000000000			14
650.0000000000000000			12
3200.0000000000000000			15
5000.0000000000000000			11
1475.0000000000000000			13
500.0000000000000000			16
```

Relational Algebra Expression:

Relational Algebra Tree:

## 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