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See also Low Culture, High Tech, which is what the violation of this rule can sometimes lead to.
Within the database, nested tables are column types that hold sets of values.
Of course, such rules are ultimately an Obstructive Code of Conduct that creates as many problems as it solves.
Crash landing on an inhabited world when this rule is in force brings obvious difficulties.
For example, Associative arrays are sets of key-value pairs, where each key is unique and is used to locate a corresponding value in the array. Assigning a value using a key for the first time adds that key to the associative array.
Subsequent assignments using the same key update the same entry. For example, key values might come from the primary key of a database table, from a numeric hash function, or from concatenating strings to form a unique string value.To look up data that is more complex than single values, you can store PL/SQL records or SQL object types in collections.