SQLite 实现if not exist 类似功能的操作

if not exists(select * from ErrorConfig where Type='RetryWaitSeconds')
begin
  insert into ErrorConfig(Type,Value1)
  values('RetryWaitSeconds','3')
end

insert into ErrorConfig(Type,Value1)
select 'RetryWaitSeconds','3'
where not exists(select * from ErrorConfig where Type='RetryWaitSeconds')

CREATE TABLE book (
 id integer primary key,
 title text,
 unique(title)
);
CREATE TABLE checkout_item (
 member_id integer,
 book_id integer,
 movie_id integer,
 unique(member_id, book_id, movie_id) on conflict replace,
 unique(book_id),
 unique(movie_id)
);
CREATE TABLE member (
 id integer primary key,
 name text,
 unique(name)
);
CREATE TABLE movie (
 id integer primary key,
 title text,
 unique(title)
);

SELECT * FROM member WHERE id NOT IN(SELECT member_id FROM checkout_item);

SELECT * FROM book WHERE id NOT IN(SELECT book_id FROM checkout_item);

SELECT * FROM book WHERE id IN(SELECT book_id FROM checkout_item);

SELECT * FROM book WHERE 
 title NOT IN( 
 SELECT title FROM book WHERE id IN(
 SELECT book_id FROM checkout_item));

SELECT * FROM book WHERE id NOT IN(SELECT book_id FROM checkout_item WHERE book_id IS NOT NULL);

SELECT book_id FROM checkout_item

SELECT member_id FROM checkout_item