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_date INTEGER)

### Question ###
Find the ids of orders which are shipped after 2000-01-01.

### Accurate SQL ###

SELECT order_id FROM shipments WHERE shipment_date > "2000-01-01"