SQL - create function that will take a table variable as an input

Question

I'm having trouble writing a function that will take a table variable as an input and return the total number of rows in that table.

Here is my try:

CREATE FUNCTION fTableRows( @table TABLE )
RETURNS INT AS
BEGIN
    RETURN( SELECT COUNT(*) FROM @table )
END

Answer 1

If you do this in SQL server 2008 + you have use user defined data type - table. Good explanation can be found here: Pass table as parameter into SQL Udf

Answer 2

CREATE FUNCTION getTableRows
(
    @TableName VARCHAR(30)
)
RETURNS INT AS
BEGIN
    RETURN( SELECT COUNT(*) FROM @TableName)
END