改变序列以链接到另一个 table

Question

所以我通过 Python 后端通过 HTTP 将大约 150,000 行数据上传到数据库中，上传需要一段时间，因此我将其插入到一个新的 table 中然后我交换（通过重命名）旧的 table:

create table tmp (like main);
alter sequence main_id_seq restart;
alter table tmp alter column id set default nextval('main_id_seq');
drop table main cascade;  -- THIS REMOVES THE SEQUENCE ^^^^^^^
alter table tmp rename to main;

如何更改序列以不链接到 main table，以便当我删除 main table 时，序列将保持链接到当前 tmp table（新 main）?

Answer 1

您可以将列 "owning" 设为序列

alter sequence main_id_seq
  owned by main.id;

Answer 2

use 改变顺序：

t=# create table s120(i bigserial);
CREATE TABLE
t=# \d+ s120;
                                            Table "public.s120"
 Column |  Type  |                    Modifiers                     | Storage | Stats target | Description
--------+--------+--------------------------------------------------+---------+--------------+-------------
 i      | bigint | not null default nextval('s120_i_seq'::regclass) | plain   |              |

t=# create table s121(i bigint);
CREATE TABLE
t=# alter sequence s120_i_seq owned by s121.i;
ALTER SEQUENCE
t=# drop table s120;
DROP TABLE
t=# alter table s121 alter COLUMN i set default nextval('s120_i_seq'::regclass);
ALTER TABLE
t=# \d+ s121
                                       Table "public.s121"
 Column |  Type  |                Modifiers                | Storage | Stats target | Description
--------+--------+-----------------------------------------+---------+--------------+-------------
 i      | bigint | default nextval('s120_i_seq'::regclass) | plain   |              |

改变序列以链接到另一个 table

Alter sequence to be linked to another table

sql

postgresql

sequence

alter

postgresql-9.5