SQL: Display the numbers in columns
SQL Basic Select Statement: Exercise-3 with Solution
Write a SQL query to display three numbers in three columns.
Sample Solution:
SELECT 5, 10, 15;
Output of the Query:
?column? 15
:Explanation:
Pictorial presentation:

Practice Online
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
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