With virtual generated columns, we avoid using additional disk storage. Instead, the database calculates their value on demand, for example, during a query. However, PostgreSQL currently lacks support for the virtual generated columns.
Stored generated columns use storage like regular ones. However, PostgreSQL updates their values only when the row is modified, not every time they're requested.
To create a stored generated column with the Drizzle ORM, we must use the function. It makes a lot of sense to refer to other columns while defining a generated column.
An immutable function does not modify the database and always returns the same result given the same arguments.
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