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SQL: Display all information about all salespeople

SQL Basic Select Statement: Exercise-1 with Solution

Write a SQL statement that displays all the information about all salespeople.

Sample table: salesman


Sample Solution:

SQL Code:

SELECT * FROM salesman;

Output of the Query:

salesman_id	name		city		commission
5001		James Hoog	New York	0.15
5002		Nail Knite	Paris		0.13
5005		Pit Alex	London		0.11
5006		Mc Lyon		Paris		0.14
5007		Paul Adam	Rome		0.13
5003		Lauson Hen	San Jose	0.12

Explanation:

SQL syntax:

SELECT [DISTINCT] [<qualifier>.]<column_name> |*|
<expression>
[AS <column_alias>],...
FROM <table_or_view_name> |
<inline_view>
[[AS] <table_alias>]
[WHERE <predicate>]
[GROUP BY [<qualifier>.]<column_name>,...
[HAVING <predicate>]
]
[ORDER_BY <column_name> |
<column_number>
[ASC | DESC],...
];

Note: Use * to get a complete list of the columns from a table.
Alternate command:
SELECT salesman_id, name, city, commission

SQL Exercises: Syntax of select all the columns from a table

Pictorial presentation :

Result of select all the columns from a table

Practice Online


Query Visualization:

Duration:

Query visualization of Select all the columns from a table - Duration

Rows:

Query visualization of Select all the columns from a table - Rows

Cost:

Query visualization of Select all the columns from a table - 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