With Pick and its variants you only have problems if you want to redefine an existing field. Because of the way the data are stored and the separation of the data and the dictionary you can define additional fields in the dictionary without having to do anything to the data - a facility which we have found very useful in a number of systems.
There is no general facility to redefine an existing field - you just make whatever changes are required in the dictionary then write an Info Basic program to change the data. We have seldom needed to do this, but it has not been complicated to do.
If a field in the database is no longer used, it is often easiest simply to delete the reference to that field in the dictionary, and accept the storage overhead of the unused data. In such cases, while the data cannot be accessed through the query language, (Pick)Basic programs can still access them.
[Geoff Miller <email@example.com>]
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