ajayk007/querysmith-spider-bird huggingface dataset:
system: You are a text-to-SQL generator. Given a database schema and a question, reply with a single valid SQLite query that answers it. Output only the SQL on one line, with no explanation and no markdown.

user: Schema:
CREATE TABLE Categories (
  CategoryID integer PRIMARY KEY,
  CategoryName text,
  Description text
);
CREATE TABLE Customers (
  CustomerID integer PRIMARY KEY,
  CustomerName text,
  ContactName text,
  Address text,
  City text,
  PostalCode text,
  Country text
);
CREATE TABLE Employees (
  EmployeeID integer PRIMARY KEY,
  LastName text,
  FirstName text,
  BirthDate date,
  Photo text,
  Notes text
);
CREATE TABLE Shippers (
  ShipperID integer PRIMARY KEY,
  ShipperName text,
  Phone text
);
CREATE TABLE Suppliers (
  SupplierID integer PRIMARY KEY,
  SupplierName text,
  ContactName text,
  Address text,
  City text,
  PostalCode text,
  Country text,
  Phone text
);
CREATE TABLE Products (
  ProductID integer PRIMARY KEY,
  ProductName text,
  SupplierID integer,
  CategoryID integer,
  Unit text,
  Price real
);
CREATE TABLE Orders (
  OrderID integer PRIMARY KEY,
  CustomerID integer,
  EmployeeID integer,
  OrderDate datetime,
  ShipperID integer
);
CREATE TABLE OrderDetails (
  OrderDetailID integer PRIMARY KEY,
  OrderID integer,
  ProductID integer,
  Quantity integer
);
-- foreign keys: Products.SupplierID -> Suppliers.SupplierID; Products.CategoryID -> Categories.CategoryID; Orders.ShipperID -> Shippers.ShipperID; Orders.CustomerID -> Customers.CustomerID; Orders.EmployeeID -> Employees.EmployeeID; OrderDetails.ProductID -> Products.ProductID; OrderDetails.OrderID -> Orders.OrderID

Hint: Berglunds snabbkp is the CompanyName; fastest shipping = Min(Subtract(ShippedDate, OrderDate))

Question: How many days was the fastest shipping of Berglunds snabbkp's order?

assistant: SELECT datediff(T2.ShippedDate, T2.OrderDate) FROM Customers AS T1 INNER JOIN Orders AS T2 ON T1.CustomerID = T2.CustomerID WHERE T1.CompanyName = 'Berglunds snabbkp' ORDER BY datediff(T2.ShippedDate, T2.OrderDate) LIMIT 1
system: You are a text-to-SQL generator. Given a database schema and a question, reply with a single valid SQLite query that answers it. Output only the SQL on one line, with no explanation and no markdown.

user: Schema:
-- drop table flight cascade constraints;
-- drop table aircraft cascade constraints;
-- drop table employee cascade constraints;
-- drop table certificate cascade constraints;

create table flight(
	flno number(4,0) primary key,
	origin varchar2(20),
	destination varchar2(20),
	distance number(6,0),
	departure_date date,
	arrival_date date,
	price number(7,2),
    aid number(9,0),
    foreign key("aid") references `aircraft`("aid"));

create table aircraft(
	aid number(9,0) primary key,
	name varchar2(30),
	distance number(6,0));

create table employee(
	eid number(9,0) primary key,
	name varchar2(30),
	salary number(10,2));

create table certificate(
	eid number(9,0),
	aid number(9,0),
	primary key(eid,aid),
	foreign key("eid") references `employee`("eid"),
	foreign key("aid") references `aircraft`("aid"));

Question: What is the count of aircrafts that have a distance between 1000 and 5000?

assistant: SELECT count(*) FROM Aircraft WHERE distance BETWEEN 1000 AND 5000
system: You are a text-to-SQL generator. Given a database schema and a question, reply with a single valid SQLite query that answers it. Output only the SQL on one line, with no explanation and no markdown.

user: Schema:
CREATE TABLE customer (
  c_custkey integer PRIMARY KEY,
  c_mktsegment text,
  c_nationkey integer,
  c_name text,
  c_address text,
  c_phone text,
  c_acctbal real,
  c_comment text
);
CREATE TABLE lineitem (
  l_shipdate date,
  l_orderkey integer PRIMARY KEY,
  l_discount real,
  l_extendedprice real,
  l_suppkey integer,
  l_quantity integer,
  l_returnflag text,
  l_partkey integer,
  l_linestatus text,
  l_tax real,
  l_commitdate date,
  l_receiptdate date,
  l_shipmode text,
  l_linenumber integer PRIMARY KEY,
  l_shipinstruct text,
  l_comment text
);
CREATE TABLE nation (
  n_nationkey integer PRIMARY KEY,
  n_name text,
  n_regionkey integer,
  n_comment text
);
CREATE TABLE orders (
  o_orderdate date,
  o_orderkey integer PRIMARY KEY,
  o_custkey integer,
  o_orderpriority text,
  o_shippriority integer,
  o_clerk text,
  o_orderstatus text,
  o_totalprice real,
  o_comment text
);
CREATE TABLE part (
  p_partkey integer PRIMARY KEY,
  p_type text,
  p_size integer,
  p_brand text,
  p_name text,
  p_container text,
  p_mfgr text,
  p_retailprice real,
  p_comment text
);
CREATE TABLE partsupp (
  ps_partkey integer PRIMARY KEY,
  ps_suppkey integer PRIMARY KEY,
  ps_supplycost real,
  ps_availqty integer,
  ps_comment text
);
CREATE TABLE region (
  r_regionkey integer PRIMARY KEY,
  r_name text,
  r_comment text
);
CREATE TABLE supplier (
  s_suppkey integer PRIMARY KEY,
  s_nationkey integer,
  s_comment text,
  s_name text,
  s_address text,
  s_phone text,
  s_acctbal real
);
-- foreign keys: customer.c_nationkey -> nation.n_nationkey; lineitem.l_partkey -> partsupp.ps_partkey; lineitem.l_suppkey -> partsupp.ps_suppkey; lineitem.l_orderkey -> orders.o_orderkey; nation.n_regionkey -> region.r_regionkey; orders.o_custkey -> customer.c_custkey; partsupp.ps_suppkey -> supplier.s_suppkey; partsupp.ps_partkey -> part.p_partkey; supplier.s_nationkey -> nation.n_nationkey

Hint: items refer to l_linenumber; shipped via air in 1994 refers to year(l_shipdate) = 1994 where l_shipmode = 'AIR'; returned refer to l_returnflag = 'R';

Question: How many items that were shipped via air were returned in 1994?

assistant: SELECT COUNT(l_linenumber) FROM lineitem WHERE l_returnflag = 'R' AND l_shipmode = 'AIR' AND STRFTIME('%Y', l_shipdate) = '1994'
system: You are a text-to-SQL generator. Given a database schema and a question, reply with a single valid SQLite query that answers it. Output only the SQL on one line, with no explanation and no markdown.

user: Schema:
CREATE TABLE Episode (
  episode_id text PRIMARY KEY,
  season integer,
  episode integer,
  number_in_series integer,
  title text,
  summary text,
  air_date text,
  episode_image text,
  rating real,
  votes integer
);
CREATE TABLE Person (
  name text PRIMARY KEY,
  birthdate text,
  birth_name text,
  birth_place text,
  birth_region text,
  birth_country text,
  height_meters real,
  nickname text
);
CREATE TABLE Award (
  award_id integer PRIMARY KEY,
  organization text,
  year integer,
  award_category text,
  award text,
  person text,
  role text,
  episode_id text,
  season text,
  song text,
  result text
);
CREATE TABLE Character_Award (
  award_id integer,
  character text
);
CREATE TABLE Credit (
  episode_id text,
  category text,
  person text,
  role text,
  credited text
);
CREATE TABLE Keyword (
  episode_id text PRIMARY KEY,
  keyword text PRIMARY KEY
);
CREATE TABLE Vote (
  episode_id text,
  stars integer,
  votes integer,
  percent real
);
-- foreign keys: Award.episode_id -> Episode.episode_id; Award.person -> Person.name; Character_Award.award_id -> Award.award_id; Credit.person -> Person.name; Credit.episode_id -> Episode.episode_id; Keyword.episode_id -> Episode.episode_id; Vote.episode_id -> Episode.episode_id

Hint: nominated for Primetime Emmy Award but did not win refers to award_category = 'Primetime Emmy' and result = 'Nominee';  from 2009 to 2010 refers to year > = '2009' and  year < = '2010'

Question: What are the characters that were nominated for Primetime Emmy Award from 2009 to 2010 but did not win?

assistant: SELECT T2.character FROM Award AS T1 INNER JOIN Character_Award AS T2 ON T1.award_id = T2.award_id WHERE T1.award_category = 'Primetime Emmy' AND T1.year BETWEEN 2009 AND 2010 AND T1.result != 'Winner';
system: You are a text-to-SQL generator. Given a database schema and a question, reply with a single valid SQLite query that answers it. Output only the SQL on one line, with no explanation and no markdown.

user: Schema:
CREATE TABLE ATT_CLASSES (
  ATT_CLASS_ID integer PRIMARY KEY,
  ATT_CLASS text
);
CREATE TABLE OBJ_CLASSES (
  OBJ_CLASS_ID integer PRIMARY KEY,
  OBJ_CLASS text
);
CREATE TABLE IMG_OBJ (
  IMG_ID integer PRIMARY KEY,
  OBJ_SAMPLE_ID integer PRIMARY KEY,
  OBJ_CLASS_ID integer,
  X integer,
  Y integer,
  W integer,
  H integer
);
CREATE TABLE IMG_OBJ_ATT (
  IMG_ID integer PRIMARY KEY,
  ATT_CLASS_ID integer PRIMARY KEY,
  OBJ_SAMPLE_ID integer PRIMARY KEY
);
CREATE TABLE PRED_CLASSES (
  PRED_CLASS_ID integer PRIMARY KEY,
  PRED_CLASS text
);
CREATE TABLE IMG_REL (
  IMG_ID integer PRIMARY KEY,
  PRED_CLASS_ID integer PRIMARY KEY,
  OBJ1_SAMPLE_ID integer PRIMARY KEY,
  OBJ2_SAMPLE_ID integer PRIMARY KEY
);
-- foreign keys: IMG_OBJ.OBJ_CLASS_ID -> OBJ_CLASSES.OBJ_CLASS_ID; IMG_OBJ_ATT.IMG_ID -> IMG_OBJ.IMG_ID; IMG_OBJ_ATT.OBJ_SAMPLE_ID -> IMG_OBJ.OBJ_SAMPLE_ID; IMG_OBJ_ATT.ATT_CLASS_ID -> ATT_CLASSES.ATT_CLASS_ID; IMG_REL.IMG_ID -> IMG_OBJ.IMG_ID; IMG_REL.OBJ2_SAMPLE_ID -> IMG_OBJ.OBJ_SAMPLE_ID; IMG_REL.IMG_ID -> IMG_OBJ.IMG_ID; IMG_REL.OBJ1_SAMPLE_ID -> IMG_OBJ.OBJ_SAMPLE_ID; IMG_REL.PRED_CLASS_ID -> PRED_CLASSES.PRED_CLASS_ID

Hint: samples of animal objects refer to OBJ_SAMPLE_ID where OBJ_CLASS = 'animal'; image no.660 refers to IMG_ID = 660;

Question: How many samples of animal objects are there in image no.660?

assistant: SELECT COUNT(T1.IMG_ID) FROM IMG_OBJ AS T1 INNER JOIN OBJ_CLASSES AS T2 ON T1.OBJ_CLASS_ID = T2.OBJ_CLASS_ID WHERE T2.OBJ_CLASS = 'animal' AND T1.IMG_ID = 660
system: You are a text-to-SQL generator. Given a database schema and a question, reply with a single valid SQLite query that answers it. Output only the SQL on one line, with no explanation and no markdown.

user: Schema:
CREATE TABLE employee (
  employee_id integer PRIMARY KEY,
  first_name text,
  last_name text,
  address text,
  city text,
  state text,
  zip integer,
  phone text,
  title text,
  salary integer,
  supervisor integer
);
CREATE TABLE establishment (
  license_no integer PRIMARY KEY,
  dba_name text,
  aka_name text,
  facility_type text,
  risk_level integer,
  address text,
  city text,
  state text,
  zip integer,
  latitude real,
  longitude real,
  ward integer
);
CREATE TABLE inspection (
  inspection_id integer PRIMARY KEY,
  inspection_date date,
  inspection_type text,
  results text,
  employee_id integer,
  license_no integer,
  followup_to integer
);
CREATE TABLE inspection_point (
  point_id integer PRIMARY KEY,
  Description text,
  category text,
  code text,
  fine integer,
  point_level text
);
CREATE TABLE violation (
  inspection_id integer PRIMARY KEY,
  point_id integer PRIMARY KEY,
  fine integer,
  inspector_comment text
);
-- foreign keys: employee.supervisor -> employee.employee_id; inspection.followup_to -> inspection.inspection_id; inspection.license_no -> establishment.license_no; inspection.employee_id -> employee.employee_id; violation.point_id -> inspection_point.point_id; violation.inspection_id -> inspection.inspection_id

Hint: inspection from ID 52270 to 52272 refers to inspection_id between 52270 and 52272

Question: Calculate the total salary for employees who did inspection from ID 52270 to 52272.

assistant: SELECT SUM(T2.salary) FROM inspection AS T1 INNER JOIN employee AS T2 ON T1.employee_id = T2.employee_id WHERE T1.inspection_id BETWEEN 52270 AND 52272
system: You are a text-to-SQL generator. Given a database schema and a question, reply with a single valid SQLite query that answers it. Output only the SQL on one line, with no explanation and no markdown.

user: Schema:
PRAGMA foreign_keys = ON;

CREATE TABLE Addresses (
address_id INTEGER NOT NULL,
line_1 VARCHAR(80),
line_2 VARCHAR(80),
city VARCHAR(50),
zip_postcode CHAR(20),
state_province_county VARCHAR(50),
country VARCHAR(50),
PRIMARY KEY (address_id)
);

Question: What are the ids of all students for courses and what are the names of those courses?

assistant: SELECT T1.student_id , T2.course_name FROM student_course_registrations AS T1 JOIN courses AS T2 ON T1.course_id = T2.course_id
system: You are a text-to-SQL generator. Given a database schema and a question, reply with a single valid SQLite query that answers it. Output only the SQL on one line, with no explanation and no markdown.

user: Schema:
CREATE TABLE essays (
  projectid text,
  teacher_acctid text,
  title text,
  short_description text,
  need_statement text,
  essay text
);
CREATE TABLE projects (
  projectid text PRIMARY KEY,
  teacher_acctid text,
  schoolid text,
  school_ncesid text,
  school_latitude real,
  school_longitude real,
  school_city text,
  school_state text,
  school_zip integer,
  school_metro text,
  school_district text,
  school_county text,
  school_charter text,
  school_magnet text,
  school_year_round text,
  school_nlns text,
  school_kipp text,
  school_charter_ready_promise text,
  teacher_prefix text,
  teacher_teach_for_america text,
  teacher_ny_teaching_fellow text,
  primary_focus_subject text,
  primary_focus_area text,
  secondary_focus_subject text,
  secondary_focus_area text,
  resource_type text,
  poverty_level text,
  grade_level text,
  fulfillment_labor_materials real,
  total_price_excluding_optional_support real,
  total_price_including_optional_support real,
  students_reached integer,
  eligible_double_your_impact_match text,
  eligible_almost_home_match text,
  date_posted date
);
CREATE TABLE donations (
  donationid text PRIMARY KEY,
  projectid text,
  donor_acctid text,
  donor_city text,
  donor_state text,
  donor_zip text,
  is_teacher_acct text,
  donation_timestamp datetime,
  donation_to_project real,
  donation_optional_support real,
  donation_total real,
  dollar_amount text,
  donation_included_optional_support text,
  payment_method text,
  payment_included_acct_credit text,
  payment_included_campaign_gift_card text,
  payment_included_web_purchased_gift_card text,
  payment_was_promo_matched text,
  via_giving_page text,
  for_honoree text,
  donation_message text
);
CREATE TABLE resources (
  resourceid text PRIMARY KEY,
  projectid text,
  vendorid integer,
  vendor_name text,
  project_resource_type text,
  item_name text,
  item_number text,
  item_unit_price real,
  item_quantity integer
);
-- foreign keys: donations.projectid -> projects.projectid; resources.projectid -> projects.projectid

Hint: donor "000eebf28658900e63b538cf8a73afbd" refers to donor_acctid = '000eebf28658900e63b538cf8a73afbd'; highest poverty level refers to poverty_level = 'highest poverty';

Question: Among the schools donated by donor "000eebf28658900e63b538cf8a73afbd",how many schools whose poverty level are highest?

assistant: SELECT COUNT(T1.schoolid) FROM projects AS T1 INNER JOIN donations AS T2 ON T1.projectid = T2.projectid WHERE T1.poverty_level = 'highest poverty' AND T2.donor_acctid = '000eebf28658900e63b538cf8a73afbd'
system: You are a text-to-SQL generator. Given a database schema and a question, reply with a single valid SQLite query that answers it. Output only the SQL on one line, with no explanation and no markdown.

user: Schema:
PRAGMA foreign_keys = ON;

CREATE TABLE "roller_coaster" (
"Roller_Coaster_ID" int,
"Name" text,
"Park" text,
"Country_ID" int,
"Length" real,
"Height" real,
"Speed" text,
"Opened" text,
"Status" text,
PRIMARY KEY ("Roller_Coaster_ID"),
FOREIGN KEY ("Country_ID") REFERENCES `country`("Country_ID")
);

CREATE TABLE "country" (
"Country_ID" int,
"Name" text,
"Population" int,
"Area" int,
"Languages" text,
PRIMARY KEY ("Country_ID")
);

Question: List the names of countries whose language is not "German".

assistant: SELECT Name FROM country WHERE Languages != "German"
system: You are a text-to-SQL generator. Given a database schema and a question, reply with a single valid SQLite query that answers it. Output only the SQL on one line, with no explanation and no markdown.

user: Schema:
-- drop table flight cascade constraints;
-- drop table aircraft cascade constraints;
-- drop table employee cascade constraints;
-- drop table certificate cascade constraints;

create table flight(
	flno number(4,0) primary key,
	origin varchar2(20),
	destination varchar2(20),
	distance number(6,0),
	departure_date date,
	arrival_date date,
	price number(7,2),
    aid number(9,0),
    foreign key("aid") references `aircraft`("aid"));

create table aircraft(
	aid number(9,0) primary key,
	name varchar2(30),
	distance number(6,0));

create table employee(
	eid number(9,0) primary key,
	name varchar2(30),
	salary number(10,2));

create table certificate(
	eid number(9,0),
	aid number(9,0),
	primary key(eid,aid),
	foreign key("eid") references `employee`("eid"),
	foreign key("aid") references `aircraft`("aid"));

Question: What are the flight numbers for the aircraft Airbus A340-300?

assistant: SELECT T1.flno FROM Flight AS T1 JOIN Aircraft AS T2 ON T1.aid = T2.aid WHERE T2.name = "Airbus A340-300"
system: You are a text-to-SQL generator. Given a database schema and a question, reply with a single valid SQLite query that answers it. Output only the SQL on one line, with no explanation and no markdown.

user: Schema:
PRAGMA foreign_keys = ON;
CREATE TABLE `Problem_Category_Codes` (
`problem_category_code` VARCHAR(20) PRIMARY KEY,
`problem_category_description` VARCHAR(80)
);

Question: How many problems are there for product voluptatem?

assistant: SELECT count(*) FROM product AS T1 JOIN problems AS T2 ON T1.product_id = T2.product_id WHERE T1.product_name = "voluptatem"
system: You are a text-to-SQL generator. Given a database schema and a question, reply with a single valid SQLite query that answers it. Output only the SQL on one line, with no explanation and no markdown.

user: Schema:
CREATE TABLE film_text (
  film_id integer PRIMARY KEY,
  title text,
  description text
);
CREATE TABLE actor (
  actor_id integer PRIMARY KEY,
  first_name text,
  last_name text,
  last_update datetime
);
CREATE TABLE address (
  address_id integer PRIMARY KEY,
  address text,
  address2 text,
  district text,
  city_id integer,
  postal_code text,
  phone text,
  last_update datetime
);
CREATE TABLE category (
  category_id integer PRIMARY KEY,
  name text,
  last_update datetime
);
CREATE TABLE city (
  city_id integer PRIMARY KEY,
  city text,
  country_id integer,
  last_update datetime
);
CREATE TABLE country (
  country_id integer PRIMARY KEY,
  country text,
  last_update datetime
);
CREATE TABLE customer (
  customer_id integer PRIMARY KEY,
  store_id integer,
  first_name text,
  last_name text,
  email text,
  address_id integer,
  active integer,
  create_date datetime,
  last_update datetime
);
CREATE TABLE film (
  film_id integer PRIMARY KEY,
  title text,
  description text,
  release_year text,
  language_id integer,
  original_language_id integer,
  rental_duration integer,
  rental_rate real,
  length integer,
  replacement_cost real,
  rating text,
  special_features text,
  last_update datetime
);
CREATE TABLE film_actor (
  actor_id integer PRIMARY KEY,
  film_id integer PRIMARY KEY,
  last_update datetime
);
CREATE TABLE film_category (
  film_id integer PRIMARY KEY,
  category_id integer PRIMARY KEY,
  last_update datetime
);
CREATE TABLE inventory (
  inventory_id integer PRIMARY KEY,
  film_id integer,
  store_id integer,
  last_update datetime
);
CREATE TABLE language (
  language_id integer PRIMARY KEY,
  name text,
  last_update datetime
);
CREATE TABLE payment (
  payment_id integer PRIMARY KEY,
  customer_id integer,
  staff_id integer,
  rental_id integer,
  amount real,
  payment_date datetime,
  last_update datetime
);
CREATE TABLE rental (
  rental_id integer PRIMARY KEY,
  rental_date datetime,
  inventory_id integer,
  customer_id integer,
  return_date datetime,
  staff_id integer,
  last_update datetime
);
CREATE TABLE staff (
  staff_id integer PRIMARY KEY,
  first_name text,
  last_name text,
  address_id integer,
  picture blob,
  email text,
  store_id integer,
  active integer,
  username text,
  password text,
  last_update datetime
);
CREATE TABLE store (
  store_id integer PRIMARY KEY,
  manager_staff_id integer,
  address_id integer,
  last_update datetime
);

Hint: 'India' is a country; calculation = DIVIDE(SUM(country = 'India'), COUNT(customer_id)) * 100

Question: Calculate how many percent of customers were located in India.

assistant: SELECT CAST(SUM(IIF(T1.country = 'India', 1, 0)) AS REAL) * 100 / COUNT(T4.customer_id) FROM country AS T1 INNER JOIN city AS T2 ON T1.country_id = T2.country_id INNER JOIN address AS T3 ON T2.city_id = T3.city_id INNER JOIN customer AS T4 ON T3.address_id = T4.address_id
system: You are a text-to-SQL generator. Given a database schema and a question, reply with a single valid SQLite query that answers it. Output only the SQL on one line, with no explanation and no markdown.

user: Schema:
CREATE TABLE address_status (
  status_id integer PRIMARY KEY,
  address_status text
);
CREATE TABLE author (
  author_id integer PRIMARY KEY,
  author_name text
);
CREATE TABLE book_language (
  language_id integer PRIMARY KEY,
  language_code text,
  language_name text
);
CREATE TABLE country (
  country_id integer PRIMARY KEY,
  country_name text
);
CREATE TABLE address (
  address_id integer PRIMARY KEY,
  street_number text,
  street_name text,
  city text,
  country_id integer
);
CREATE TABLE customer (
  customer_id integer PRIMARY KEY,
  first_name text,
  last_name text,
  email text
);
CREATE TABLE customer_address (
  customer_id integer PRIMARY KEY,
  address_id integer PRIMARY KEY,
  status_id integer
);
CREATE TABLE order_status (
  status_id integer PRIMARY KEY,
  status_value text
);
CREATE TABLE publisher (
  publisher_id integer PRIMARY KEY,
  publisher_name text
);
CREATE TABLE book (
  book_id integer PRIMARY KEY,
  title text,
  isbn13 text,
  language_id integer,
  num_pages integer,
  publication_date date,
  publisher_id integer
);
CREATE TABLE book_author (
  book_id integer PRIMARY KEY,
  author_id integer PRIMARY KEY
);
CREATE TABLE shipping_method (
  method_id integer PRIMARY KEY,
  method_name text,
  cost real
);
CREATE TABLE cust_order (
  order_id integer PRIMARY KEY,
  order_date datetime,
  customer_id integer,
  shipping_method_id integer,
  dest_address_id integer
);
CREATE TABLE order_history (
  history_id integer PRIMARY KEY,
  order_id integer,
  status_id integer,
  status_date datetime
);
CREATE TABLE order_line (
  line_id integer PRIMARY KEY,
  order_id integer,
  book_id integer,
  price real
);
-- foreign keys: address.country_id -> country.country_id; customer_address.customer_id -> customer.customer_id; customer_address.address_id -> address.address_id; book.publisher_id -> publisher.publisher_id; book.language_id -> book_language.language_id; book_author.book_id -> book.book_id; book_author.author_id -> author.author_id

Hint: author refers to author_name; who wrote the most book refers to Max(Count(author_id))

Question: Who is the author who wrote the most books?

assistant: SELECT T1.author_name FROM author AS T1 INNER JOIN book_author AS T2 ON T1.author_id = T2.author_id GROUP BY T1.author_name ORDER BY COUNT(T2.author_id) DESC LIMIT 1