System triggers cannot be based on tables or views. So this is what I relearned today after I executed the pl\sql challenge question. after alter trigger is a system trigger and it can not be created on a table.
ora_is_alter_column is a function which can be used in trigger to compare column being altered to a column name.
ora_is_alter_column is a function which can be used in trigger to compare column being altered to a column name.
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