How to set auto increment primary key in PostgreSQL

Question

I have a table in PostgreSQL with many columns  and I want to add an auto increment primary key  I tried to create a column called id of type BIGSERIAL but pgadmin responded with an error   ERROR  sequence must have same owner as table it is linked to    Does anyone know how to fix this issue   How do I add or create an auto-incrementing primary key in PostgreSQL without recreating the table

User · Answer

Maybe I m a bit of late to answer this question  but I m working on this subject at my job      I wanted to write column  a code    c1 c2 c3 c4     Firstly I opened a column with the name ref id and the type serial  Then I solved my problem with this command    update myschema mytable set a code cast  c    ref id  as text

User · Answer

Auto incrementing primary key in postgresql   Step 1  create your table   CREATE TABLE epictable       mytable key    serial primary key      moobars        VARCHAR 40  not null      foobars        DATE      Step 2  insert values into your table like this  notice that mytable key is not specified in the first parameter list  this causes the default sequence to autoincrement   insert into epictable moobars foobars  values  delicious moobars   2012-05-01   insert into epictable moobars foobars  values  worldwide interblag   2012-05-02     Step 3  select   from your table   el voyager  psql -U pgadmin -d kurz prod -c  select   from epictable    Step 4  interpret the output   mytable key           moobars           foobars    ------------- ----------------------- ------------            1   delicious moobars       2012-05-01            2   world wide interblags   2012-05-02  2 rows    Observe that mytable key column has been auto incremented   ProTip   You should always be using a primary key on your table because postgresql internally uses hash table structures to increase the speed of inserts  deletes  updates and selects   If a primary key column  which is forced unique and non-null  is available  it can be depended on to provide a unique seed for the hash function   If no primary key column is available  the hash function becomes inefficient as it selects some other set of columns as a key

User · Answer

Steps to do it on PgAdmin   CREATE SEQUENCE sequnence title START 1     if table exist last id Add this sequense to the primary key  table - properties - columns - column id primary key  edit - Constraints - Add nextval  sequnence title   regclass  to the field default

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I have tried the following script to successfully auto-increment the primary key in PostgreSQL   CREATE SEQUENCE dummy id seq     START WITH 1 INCREMENT BY 1 NO MINVALUE NO MAXVALUE CACHE 1   CREATE table dummyTable       id bigint DEFAULT nextval  dummy id seq   regclass  NOT NULL      name character varying 50       EDIT   CREATE table dummyTable       id SERIAL NOT NULL      name character varying 50      SERIAL keyword automatically create a sequence for respective column

User · Answer

Create an auto incrementing primary key in postgresql  using a custom sequence   Step 1  create your sequence   create sequence splog adfarm seq     start 1     increment 1     NO MAXVALUE     CACHE 1  ALTER TABLE fact stock data detail seq OWNER TO pgadmin    Step 2  create your table  CREATE TABLE splog adfarm       splog key    INT unique not null      splog value  VARCHAR 100  not null      Step 3  insert into your table  insert into splog adfarm values       nextval  splog adfarm seq          Is your family tree a directed acyclic graph       insert into splog adfarm values       nextval  splog adfarm seq          Will the smart cookies catch the crumb   Find out now        Step 4  observe the rows  el defiant     psql -U pgadmin -d kurz prod -c  select   from splog adfarm   splog key                              splog value                              ---------- --------------------------------------------------------------------         1   Is your family tree a directed acyclic graph          2   Will the smart cookies catch the crumb   Find out now   3 rows    The two rows have keys that start at 1 and are incremented by 1  as defined by the sequence   Bonus Elite ProTip   Programmers hate typing  and typing out the nextval  splog adfarm seq   is annoying   You can type DEFAULT for that parameter instead  like this   insert into splog adfarm values       DEFAULT        Sufficient intelligence to outwit a thimble        For the above to work  you have to define a default value for that key column on splog adfarm table   Which is prettier

User · Answer

Try this command   ALTER TABLE your table ADD COLUMN key column BIGSERIAL PRIMARY KEY    Try it with the same DB-user as the one you have created the table

User · Answer

If you want to use numbers in a sequence  define a new sequence with something like  CREATE SEQUENCE public your sequence     INCREMENT 1     START 1     MINVALUE 1     and then alter the table to use the sequence for the id   ALTER TABLE ONLY table ALTER COLUMN id SET DEFAULT nextval  your sequence   regclass

User · Answer

If you want to do this in pgadmin  it is much easier  It seems in postgressql  to add a auto increment to a column  we first need to create a auto increment sequence and add it to the required column   I did like this   1  Firstly you need to make sure there is a primary key for your table  Also keep the data type of the primary key in bigint or smallint   I used bigint  could not find a datatype called serial as mentioned in other answers elsewhere   2 Then add a sequence by right clicking on sequence-  add new sequence   If there is no data in the table  leave the sequence as it is  don t make any changes  Just save it  If there is existing data  add the last or highest value in the primary key column to the Current value in Definitions tab as shown below    3 Finally  add the line nextval  your sequence name   regclass  to the Default value in your primary key as shown below     Make sure the sequence name is correct here  This is all and auto increment should work

[sql] How to set auto increment primary key in PostgreSQL?

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