PostgreSQL 实现给查询列表增加序号操作

SELECT ROW_NUMBER() over(ORDER bY biztypename DESC ) AS num,biztypename 
FROM (SELECT DISTINCT biztypename FROM bizmaptype) t;

CREATE TABLE book(
 id INTEGER PRIMARY KEY ,
 name CHARACTER VARYING(50),
 price DOUBLE PRECISION,
 author CHARACTER VARYING(20)
);

CREATE SEQUENCE book_id_seq
 START WITH 1
 INCREMENT BY 1
 NO MINVALUE
 NO MAXVALUE
 CACHE 1;

ALTER TABLE book ALTER COLUMN id SET DEFAULT nextval('book_id_seq');

INSERT INTO public.book VALUES (nextval('book_id_seq'),'《本色》',30.5,'乐嘉');
INSERT INTO public.book VALUES (nextval('book_id_seq'),'《平凡世界》',90.5,'路遥');
INSERT INTO public.book VALUES (nextval('book_id_seq'),'《Java编程思想》',60.5,'詹姆斯·高斯林');
INSERT INTO public.book VALUES (nextval('book_id_seq'),'《Web高级编程》',50.5,'李三');

SELECT * FROM public.book;

--查询序列 (每查询一次，序列就做了一次+1操作，即查询下一次的value)
SELECT nextval('book_id_seq'); 
--移除序列
DROP SEQUENCE 'book_id_seq';