What is the method to retrieve the SUM() of a particular value from a different column in bigquery?

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To retrieve the SUM() of a particular value from a different column in BigQuery, you can use the following SQL query:

SELECT SUM(column_name)
FROM table_name
WHERE condition;

Replace "columnname" with the name of the column you want to sum and "tablename" with the name of the table containing the column. You can also add a "WHERE" clause to specify a condition for the rows you want to sum.