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To add an incremental value to an existing value in the same table, you can use an UPDATE statement with the SET clause and the addition operator (+) to update the column value. Here's an example SQL query:
UPDATE my_table
SET my_column = my_column + incremental_value
WHERE some_condition = some_value;
In this query, my_table is the name of the table you want to update, my_column is the name of the column you want to update, and incremental_value is the value you want to add to the existing value in my_column. You can also specify a condition in the WHERE clause to update only the rows that match the condition.