question: Which Body Width/mm has a Lead Pitch/mm smaller than 0.55, and a Body Length/mm larger than 18.4?
answer: SELECT MIN(body_width_mm) FROM table_name_48 WHERE lead_pitch_mm < 0.55 AND body_length_mm > 18.4
context: CREATE TABLE table_name_48 (body_width_mm INTEGER, lead_pitch_mm VARCHAR, body_length_mm VARCHAR)