What is a mutation error and how do I avoid mutation errors while writing triggers?
A trigger fires when the underlying table experiences some sort of DML operation. If the trigger then makes another DML change to the same table, this will cause the trigger to fire again, which means another change and the trigger firing again . . . where does it end? In a nutshell, a mutating table happens when a trigger keeps firing on only one DML operation.
This link describes mutating tables in more detail as well as instructions on how to avoid it.
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