Returns a selected argument from a list of arguments.
ARGN( integer-expression, expression [ , ...] )
integer-expression The position of an argument within the list of expressions.
expression An expression of any data type passed into the function. All supplied expressions must be of the same data type.
Using the value of the integer-expression as n, returns the nth argument (starting at 1) from the remaining list of arguments. While the expressions can be of any data type, they must all be of the same data type. The integer expression must be from one to the number of expressions in the list or NULL is returned. Multiple expressions are separated by a comma.
SQL/2003 Vendor extension.
The following statement returns the value 6.
SELECT ARGN( 6, 1,2,3,4,5,6 );