Error: Null Value in Column "Id" Violates Not-Null Constraint

Postgres error: null value in column id - during insert operation

You aren't inserting a value for id. Since you don't explicitly set it, it's implicitly given a null value, which is, of course, not a valid value for a primary key column. You can avoid this entire situation by defining this column as serial instead of a plain old integer, and leave all the heavy lifting to the database.

PostgreSQL: Not null violation: 7 ERROR: null value in column id violates not-null constraint

Make sure your id column has a default:

ALTER TABLE acme_search_item
ALTER COLUMN id SET DEFAULT nextval('acme_search_item_id_seq');

You can view current defaults in the information schema tables:

SELECT  column_name
, column_default
FROM information_schema.columns
WHERE table_name = 'acme_search_item'
ORDER BY
ordinal_position;

null value in column violates not-null constraint PostgreSQL

In your table trendmania_video, you have v_id to be not null which causes this issue. You one option is to get ride of the not null constrain:

ALTER TABLE public.trendmania_video ALTER COLUMN v_id DROP NOT NULL;

If this is a new table then it's better to recreate it with a new table with an auto-cremented id while v_id is another value.

CREATE TABLE trendmania_video(
id SERIAL PRIMARY KEY,
v_id VARCHAR
--the rest of the columns
);

23502: null value in column id violates not-null constraint in postgreSQL

Looks like Entity Framework auto insert a value to the column.
After I add the script to prevent this issue, it works fine now.

[DatabaseGenerated(DatabaseGeneratedOption.None)]

Model would like:

public partial class ERRORLOG
{
[Key]
[DatabaseGenerated(DatabaseGeneratedOption.None)]
public long ID { get; set; } = DateTimeOffset.Now.ToUnixTimeMilliseconds();
public string MESSAGE { get; set; }
}

EF Core - null value in column Id of relation table violates not-null constraint

Your entity configuration does not autoincrement the Id.

Update VeganItem COnfiguration and Add this line in addition to AddKey.

    veganItem.Property(e => e.Id).IsRequired().ValueGeneratedOnAdd();

ERROR: null value in column id violates not-null constraint

You have to skip id in the INSERT operation:

INSERT INTO assignments(account_id, l_id, ...) 
VALUES
(1, 1, ...)

The id will automatically get the next sequence number, since it is an auto-increment field.

ERROR: null value in column id of relation xxx violates not-null constraint - Spring Data JPA

For it to work, you have to change somethings in your Product table.

@GeneratedValue(strategy = GenerationType.IDENTITY) just work if your ID column is SERIAL type.

Check if the ID column is that type. Example:

CREATE TABLE Product(
id SERIAL NOT NULL,
name VARCHAR(20),
etc...
)


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