CREATE TABLE "architect" (
"id" text,
"name" text,
"nationality" text,
"gender" text,
primary key("id")
)

CREATE TABLE "bridge" (
"architect_id" int,
"id" int,
"name" text,
"location" text,
"length_meters" real,
"length_feet" real,
primary key("id"),
foreign key ("architect_id" ) references `architect`("id")
)

CREATE TABLE "mill" (
"architect_id" int,
"id" int,
"location" text,
"name" text,
"type" text,
"built_year" int,
"notes" text,
primary key ("id"),
foreign key ("architect_id" ) references `architect`("id")
)
SELECT TYPE ,  count(*) FROM mill GROUP BY TYPE ORDER BY count(*) DESC LIMIT 1
What is the most common mill type, and how many are there?