Database schema:

CREATE TABLE cars (
	id INTEGER NOT NULL -- example: ['2', '1'],
	train_id INTEGER DEFAULT NULL -- example: ['2', '1'],
	position INTEGER DEFAULT NULL -- example: ['2', '1'],
	shape TEXT DEFAULT NULL -- example: ['rectangle', 'bucket'],
	len TEXT DEFAULT NULL -- example: ['long', 'short'],
	sides TEXT DEFAULT NULL -- example: ['not_double', 'double'],
	roof TEXT DEFAULT NULL -- example: ['none', 'peaked'],
	wheels INTEGER DEFAULT NULL -- example: ['2', '3'],
	load_shape TEXT DEFAULT NULL -- example: ['hexagon', 'circle'],
	load_num INTEGER DEFAULT NULL -- example: ['1', '3'],
	PRIMARY KEY (id), 
	CONSTRAINT fk_cars_trains FOREIGN KEY(train_id) REFERENCES trains (id)
)


CREATE TABLE trains (
	id INTEGER NOT NULL -- example: ['2', '1'],
	direction TEXT DEFAULT NULL -- example: ['west', 'east'],
	PRIMARY KEY (id)
)

Question: Please list the IDs of all the cars on train no.1 that have 2 wheels.
Evidence: train no.1 refers to train_id = 1; 2 wheels refers to wheels = 2

SQL:
SELECT id FROM cars WHERE train_id = 1 AND wheels = 2