How to connect the values of a field in a table into strings in SQL Server

In the previous article, a function is used to convert a string into a table based on a specific separator.
How can I implement this Article in turn?
Many people will think of a cursor loop table to achieve the goal. It is true that this can achieve the effect. But it can be said that it is the worst implementation method.
So how should we implement it? In fact, it is very simple. It can be done with only three statements. Declare   @ Str   Varchar ( 8000 )
Select   @ Str   =   Isnull ( @ Str , '' ) + [ Field name ] + ' Separator '   From Table Name
Select   @ Str

Good results have been achieved ..