SQLQuokkaSQLQuokkaRetail executives track seasonal category performance across marketplace orders. Write a query to pivot order revenue by calendar month into separate category columns for 'Electronics', 'Apparel', and 'Home'. Output four columns: `order_month` (formatted as 'YYYY-MM'), `electronics_rev`, `apparel_rev`, and `home_rev`. Revenue is calculated as the sum of `quantity * unit_price` for products in that category. If a category generated zero sales in a given month, report 0 (not NULL). Order the result chronologically by `order_month` ascending.
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