![]() But when I insert a new sql in my app, still get a small seed id. The counter only gets incremented when you call a Sequence Manipulation Function. How to check the table primary key current start with value?When I am using this command to check the current seed value of id: select CURRVAL(pg_get_serial_sequence('public.rss_sub_source', 'id')) I am using this command to modify the start with value: ALTER TABLE rss_sub_source Rep_lastest_refresh_time int8 NULL DEFAULT 0,ĭynamic_interval int4 NOT NULL DEFAULT 0,ĬONSTRAINT rss_sub_source_pkey PRIMARY KEY (id),ĬONSTRAINT unique_sub_url UNIQUE (sub_url) Standard_version varchar(32) NOT NULL DEFAULT 'rss20'::character varying,Ĭron varchar NOT NULL DEFAULT '0 */1 * * * *'::character varying, Standard_type varchar(32) NOT NULL DEFAULT 'RSS'::character varying, This is the same in Oracle, Microsoft SQL Server, PostgreSQL, MySQL, DB2, Informix, etc. Id int8 NOT NULL GENERATED ALWAYS AS IDENTITY,Ĭreated_time int8 NOT NULL DEFAULT date_part('epoch'::text, now()), 1 Answer Sorted by: 2 The SQL:2003 standard defined sequences to start at 1 by default (though you may change the default and define a sequence to start at 0 or another value if you prefer). This is my table create command: - Drop table MINVALUE: This specifies the lower bound for a sequence. If the increment value is negative, then the sequence is a decreasing sequence else it is ascending. If you have a serial ID column (ie auto incrementing ID), theyll start at 1 by default, but sometimes you may want them to start at a different number. incrementvalue: This is the interval between two consecutive sequence values. However, the next generated serial value can be defined with the setval ('sequence', value, true/false) SQL function. startvalue: The first value in the sequence. What should I do to make it work? This command still not work: ALTER TABLE rss_sub_source It is not possible to define a start value directly in the database like with SERIAL (100). Then I modify the SQL like that: ALTER TABLE rss_sub_sourceĭid not work shows SQL Error : ERROR: syntax error at or near "(" Position: 74. Shows this column already as a identify column. What are Identity Columns Asked 6 years, 5 months ago Modified 5 years, 1 month ago Viewed 13k times 13 I was reviewing the commit-fest scheduled for 7/01 for PostgreSQL and I saw that Pg is likely going to get 'identity columns' sometime soon. I have tried this way: ALTER TABLE rss_sub_sourceĪLTER id ADD GENERATED ALWAYS AS IDENTITY Now I want to modify the start with value(I forget to define the start with value when I added identify column). Select setval('public.I have a table rss_sub_source, and the id as a identify column. Run the following commands in the target database: select setval('q'::regclass, 103) Select setval('public."Seq"'::regclass, 3) (pg_sequence_parameters(oid)).start_value) + 1) I would like to set the the sequence to start at 10000 and increase sequentially from there but I can't seem to get that to work. The new sequence can be altered and configured as a regular sequence. NOTICE: select setval('"P12"."Seq"'::regclass, 4) įor PostgreSQL 10 and later versions, the sample code for setting SQL for sequences obtained from the original database is listed below: postgres=> select format($$ PostgreSQL: setting serial start value setting serial start value I have a table with a field called 'id' that is a serial field and pkey. By assigning a SERIAL type to a column as part of table creation, PostgreSQL creates a sequence using default configuration and adds the NOT NULL constraint to the column. By digoal Background Currently, Alibaba Cloud DTS does not support the migration of sequence values. ![]() Example: > test> CREATE TABLE users (id serial PRIMARY KEY, username text) > NOTICE: CREATE TABLE will create implicit sequence 'usersidseq' > for 'serial' column 'users. digoal Decem2,219 0 This short article explains the sample code for setting SQL for sequences in PostgreSQL. NOTICE: select setval('public."Seq"'::regclass, 3) use RESTART WITH to set the sequence's current value. ![]() Otherwise, the sequence values generated by the business that uses the sequence will return to the previous version, and UK PK generated by the sequence will also report conflicts.įor PostgreSQL 9.6 and earlier versions, the sample code for setting SQL for sequences obtained from the original database is listed below: do language plpgsql $$įor nsp,rel in select nspname,relname from pg_class t2, pg_namespace t3 where t2.relnamespace=t3.oid and t2.relkind='S'Įxecute format($_$select last_value from %I.%I$_$, nsp, rel) into val įormat($_$select setval('%I.%I'::regclass, %s) $_$, nsp, rel, val+1) When DTS is used to migrate data from a PostgreSQL database, you must synchronize the sequence values from the source database to the target database manually after the data migration is completed. Currently, Alibaba Cloud DTS does not support the migration of sequence values.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |