(PHP 4 )
When the type argument is SQL_BEST_ROWID, odbc_specialcolumns() returns the column or
columns that uniquely identify each row in the table.
When the type argument is SQL_ROWVER, odbc_specialcolumns() returns the optimal
column or set of columns that, by retrieving values from the
column or columns, allows any row in the specified table to
be uniquely identified.
Returns an ODBC result identifier or FALSE on failure.
The result set has the following columns:
The result set is ordered by SCOPE.