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SQL: Select specific columns from a table

SQL Basic Select Statement: Exercise-6 with Solution

Write a SQL statement to display specific columns such as names and commissions for all salespeople.

Sample table: salesman


Sample Solution:

SELECT name, commission
FROM salesman; 

Output of the Query:

name		commission
James Hoog	0.15
Nail Knite	0.13
Pit Alex	0.11
Mc Lyon		0.14
Paul Adam	0.13
Lauson Hen	0.12

Explanation:

Syntax of select specific columns from a table

Pictorial presentation :

Result of select specific columns from a table

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Query Visualization:

Duration:

Query visualization of Select specific columns from a table - Duration

Rows:

Query visualization of Select specific columns from a table - Rows

Cost:

Query visualization of Select specific columns from a table - Cost

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Previous: Write a query to display the result of an arithmetic simplification.
Next: Write a query to display the columns in a specific order like order date, salesman id, order number and purchase amount from for all the orders.

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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