... PHP 4 >= 4.0.0) odbc_specialcolumns -- Returns either the optimal set of columns that uniquely identifies a row in the table or columns that are automatically updated when any value in the row is updated by a transaction . ... 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. ... The result set has the following columns: . ...