>>Michel, Sorry I am not providing any help with your question, but I would change the whole approach, after all why do you update fields that can be calculated when required? You can easily create a view with this information without the massive updates with values that are derived from other tables/fields.
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>This is a process to fix values in an existing table.
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>The live maintenance of those fields is done whenever a record is being updated.

Do you mean in a trigger?