SQL: Display a given string
SQL Basic Select Statement: Exercise-2 with Solution
Write a query to display a string "This is SQL Exercise, Practice and Solution".
Sample Solution:
SELECT "This is SQL Exercise, Practice and Solution";
Output of the Query:
?column? This is SQL Exercise, Practice and Solution
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:Explanation:
Note: You can use literal string (enclosed in single or double quotation mark) just like we use a column name in the SELECT statement. If you use the literal string with a column then it will be displayed in every row of the query results.

Pictorial presentation:

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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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