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SAP suggests that you prohibit any editing changes to a primary key, for example, by revoking all permissions on that column.

However, to prohibit updates only under certain circumstances, use a trigger. Modifications to the data in that column cause the trigger fire. When this trigger detects an update that violates the trigger conditions, it cancels the update and prints a message.

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For example, you can create a trigger on Because triggers execute within a transaction, a failure at any level of a set of nested triggers cancels the entire transaction, and all data modifications are rolled back.

You can use these temporary, memory-resident tables to test the effects of certain data modifications and to set conditions for DML trigger actions.create trigger stopupdatetrig on titles for update as if update (title_id) and datename(dw, getdate()) in ("Saturday", "Sunday") begin rollback transaction print "We do not allow changes to" print "primary keys on the weekend!I am trying to figure out a conditional trigger for an update to a My SQL table.The example prevents updates to the primary key on weekends, and prevents updates to the price or advance of a title, unless the total revenue amount for that title surpasses its advance amount.You can use the same trigger name because the modified trigger replaces the old trigger when you create it again.

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