Task: Text to Code
Input (English): Step 1: For each row in Invoices table, find the corresponding rows in Shipments table.
Step 2: find invoice_date of the results of step 1 whose shipment_tracking_number equals 3452
Output (English): SELECT T1.invoice_date FROM Invoices AS T1 JOIN Shipments AS T2 ON T1.invoice_number = T2.invoice_number WHERE T2.shipment_tracking_number = 3452