ICAO and IATA boith require that the following groups require DG training:
flight crew and load planners,
cabin crew and check-in staff,
loaders and warehouse staff.
Essentially in agreement, ICAO and IATA both specify separate DG training courses for each of the above groups. In fact, IATA goes into further detail in identifying the different groups and the specific degree of DG training required for them.
The DG courses for these groups are sometimes referred to as awareness courses and they all include a written examination.
All companies should be aware of this.
The correct definition of "ignorance" is "culpable lack of knowledge". How many companies are acting in ignorance? Check your companies training records and, where necessary, demand appropriate action. Somebody's life could depend on it.... it could be yours!