Every programmer knows what happens when a master record in the database is accidentally erased.
The child tables become invisible. All of the small bits of information that have been related to one index in the master table can no longer find their place. An alternate view is that without a master index, all the small bits of information that already exist must do so in isolation, and are accordingly devoid of the significance they might otherwise hold. I observe three different general thrusts in medical database development. Firstly there is the Commercial wing , with many worthy applications already on the market.