﻿ SQL: Calculate the average price of all products of the manufacturer whose code is 16 - w3resource

SQL: Calculate the average price of all products of the manufacturer whose code is 16

SQL Basic Select Statement: Exercise-26 with Solution.

From the following table, write a SQL query to calculate the average price for a manufacturer code of 16. Return avg.

Sample table: item_mast

Sample Solution:

``````SELECT AVG(pro_price) FROM item_mast
WHERE pro_com=16;
``````

Output of the Query:

```avg
500.0000000000000000
```

Relational Algebra Expression:

Relational Algebra Tree:

Query Visualization:

Duration:

Rows:

Cost:

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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