1、创建序列 CREATESEQUENCEifnotexists test_mergetable_id_seq INCREMENT 1 MINVALUE 1 MAXVALUE 999999999 START 1 CACHE 1; //或者: createsequenceifnotexists test_mergetable_id_seq incrementby1 minvalue 1nomaxvalue startwith1; 2、指定序列(给表的主键指定创建好的序列) alter table test_mergetable ...
CREATESEQUENCEifnotexiststest_mergetable_id_seq INCREMENT1MINVALUE1MAXVALUE999999999START1CACHE1;--或者:createsequenceifnotexiststest_mergetable_id_seq incrementby1minvalue1no maxvalue startwith1; 4、指定序列(给表的主键指定创建好的序列) altertabletest_mergetablealtercolumn"i_id"setdefaultnextval('tes...
('three');每查询一次,序列的值就自减一,当减去至0时,如果再次查询则会报错 案例3: 将表和序列关联起来 create tablemytable(order_id serial,item_idintnotnull,product_idintnotnull,pricedec(10,2)notnull,primarykey(order_id,item_id));create sequenceifnot exists mytable_seq start10minvalue10...
MySQL的序列有以下限制: (1)自增长只能用于表中的某一个字段。 (2)自增长只能被分配给固定表的某一个固定的字段,不能被多个表共用。 但是Postgresql数据库没有以上限制。 1.序列的创建 语法如下: CREATE [ TEMPORARY | TEMP ] SEQUENCE [ IF NOT EXISTS ] name [ AS data_type ] [ INCREMENT [ BY ] ...
create sequence fl_user_seq increment by 1 minvalue 1 no maxvalue start with 1; 1. 2、更改序列值(方法中两个参数分别是1.序列名字,2.序列修改后值): select setval('fl_user_seq ', 88); 1. 3、创建序列 CREATE SEQUENCE if not exists test_mergetable_id_seq ...
CREATESEQUENCEsq_commonSTART1INCREMENT1MINVALUE1MAXVALUE200000000CACHE10;CREATESEQUENCE-- 简单写法CREATESEQUENCEsq_common;-- 完整的语法CREATE[{TEMPORARY|TEMP}|UNLOGGED]SEQUENCE[IFNOTEXISTS]name[ASdata_type][INCREMENT[BY]increment][MINVALUEminvalue|NOMINVALUE][MAXVALUEmaxvalue|NOMAXVALUE][START[WITH]sta...
To create a new sequence, you use theCREATE SEQUENCEstatement. PostgreSQL CREATE SEQUENCE statement The following illustrates the syntax of theCREATE SEQUENCEstatement: CREATESEQUENCE[ IF NOT EXISTS ] sequence_name[ AS { SMALLINT | INT | BIGINT } ][ INCREMENT [ BY ] increment ][ MINVALUE min...
看来你找到了一个小bug。我可以在Postgres 9.6和10中重新创建它：
COMMENT ON COLUMN public.t_user.create_time IS '创建时间'; COMMENT ON COLUMN public.t_user.update_time IS '更新时间'; -- 创建自增序列alter sequence "t_user_ID_seq" restart with 1 increment by 1; -- 创建主键序列 drop index if exists "t_user_pkey"; ...
CREATE SEQUENCE test START 1;create table if not exists testpg ("id" int8 not null DEFAULT nextval('test'::regclass),CONSTRAINT "user_vendorcode_pkey" PRIMARY KEY ("id"),"suijishuzi" VARCHAR ( 255 ) COLLATE "pg_catalog"."default"); ...