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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 Expression: Calculate the average price of all products of the manufacturer which code is 16.

Relational Algebra Tree:

Relational Algebra Tree: Calculate the average price of all products of the manufacturer which code is 16.

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Query Visualization:

Duration:

Query visualization of Calculate the average price of all products of the manufacturer which code is 16 - Duration

Rows:

Query visualization of Calculate the average price of all products of the manufacturer which code is 16 - Rows

Cost:

Query visualization of Calculate the average price of all products of the manufacturer which code is 16 - Cost

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Previous: From the following table, write a SQL query to select a range of products whose price is in the range Rs.200 to Rs.600. Begin and end values are included. Return pro_id, pro_name, pro_price, and pro_com.
Next: From the following table, write a SQL query to display the pro_name as 'Item Name' and pro_priceas 'Price in Rs.'

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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