CREATE TABLE shipments (order_id VARCHAR, shipment_tracking_number VARCHAR)
CREATE TABLE orders (date_order_placed VARCHAR, order_id VARCHAR)

When was the order placed whose shipment tracking number is 3452? Give me the date.
SELECT T1.date_order_placed FROM orders AS T1 JOIN shipments AS T2 ON T1.order_id = T2.order_id WHERE T2.shipment_tracking_number = 3452
SELECT "T1"."date_order_placed" FROM "orders" AS "T1" JOIN "shipments" AS "T2" ON "T1"."order_id" = "T2"."order_id" AND "T2"."shipment_tracking_number" = 3452