Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE shipments ( order_id VARCHAR, shipment_tracking_number VARCHAR )
TABLE: CREATE TABLE orders ( date_order_placed VARCHAR, order_id VARCHAR )

### Question ###
When was the order placed whose shipment tracking number is 3452? Give me the date.

### Accurate SQL ###

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