SELECT * FROM mall_inventory on_hand <= safety_stock ORDER BY id SELECT * FROM mall_inventory WHERE id = #{id} SELECT * FROM mall_inventory WHERE sku = #{sku} INSERT INTO mall_inventory (product_id, option_id, sku, on_hand, reserved, safety_stock, erp_sync_status) VALUES (#{productId}, #{optionId}, #{sku}, COALESCE(#{onHand},0), COALESCE(#{reserved},0), COALESCE(#{safetyStock},0), COALESCE(#{erpSyncStatus},'NONE')) UPDATE mall_inventory SET on_hand = GREATEST(COALESCE(on_hand,0) + #{delta}, 0), updated_at = NOW() WHERE id = #{id} UPDATE mall_inventory SET erp_sync_status = #{status}, on_hand = COALESCE(#{onHand}, on_hand), updated_at = NOW() WHERE id = #{id}