SQL Trivia – What are Niladic functions in SQL Server?

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SQL Trivia – What are Niladic functions in SQL Server?

March 30, 2016 Leave a comment Go to comments

Niladic functions are functions that do not accept any parameters, are specified without parentheses, and return only one result.

Following is the list of Niladic functions:

Niladic function (SQL-92)	Value returned
CURRENT_TIMESTAMP	Current date and time.
CURRENT_USER	Name of user performing an insert.
SESSION_USER	Name of user performing an insert.
SYSTEM_USER	Name of user performing an insert.
USER	Name of user performing an insert.

Execution of below query with these functions gives following results:

SELECT 
	 CURRENT_TIMESTAMP AS 'CURRENT TIMESTAMP'
	,CURRENT_USER AS 'CURRENT USER'
	,SESSION_USER AS 'SESSION USER'
	,SYSTEM_USER AS 'SYSTEM USER'
	,USER AS 'USER'

Niladic functions