-- Database schema
| Staff : staff_id [ INT ] primary_key , gender [ TEXT ] , first_name [ TEXT ] , last_name [ TEXT ] , email_address [ TEXT ] , phone_number [ TEXT ] | Customers : customer_id [ INT ] primary_key , customer_type_code [ TEXT ] , address_line_1 [ TEXT ] , address_line_2 [ TEXT ] , town_city [ TEXT ] , state [ TEXT ] , email_address [ TEXT ] , phone_number [ TEXT ] | Products : product_id [ INT ] primary_key , parent_product_id [ INT ] , product_category_code [ TEXT ] , date_product_first_available [ TEXT ] , date_product_discontinued [ TEXT ] , product_name [ TEXT ] , product_description [ TEXT ] , product_price [ INT ] | Complaints : complaint_id [ INT ] , product_id [ INT ] Complaints.product_id = Products.product_id , customer_id [ INT ] Complaints.customer_id = Customers.customer_id , complaint_outcome_code [ TEXT ] , complaint_status_code [ TEXT ] , complaint_type_code [ TEXT ] , date_complaint_raised [ TEXT ] , date_complaint_closed [ TEXT ] , staff_id [ INT ] Complaints.staff_id = Staff.staff_id |
-- -- How many customers are there in the customer type with the most customers?

SELECT count(*) FROM customers GROUP BY customer_type_code ORDER BY count(*) DESC LIMIT 1;