How to locate non-used table fields

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Hello,

I would like to know if there is a way to know if a table field(s) is
(are) used by application or stored procedures.

I have an old DB with some tables. Those tables have fields, that were
in use once - data was written into and read from them by application
and stored procedures.

The new application and stored procedures do not use some of those
fields.

Is there a way to find out what fields are "obsolete"?

Thanks in advance.

.