Anonymous
Anonymous Asked in Cars &Transportation · 2 weeks ago

Do Postgres tables need a primary key?

Contents
  1. Do Postgres tables have to have a primary key?
  2. Is it mandatory to use primary key?
  3. Can a DB exist without primary key?
  4. Is primary key mandatory for a table in SQL?
Of note, the old value of the primary key is included in UPDATE and DELETE messages. A table with no primary key will only send out INSERTs on .In PostgreSQL what tables with no primary key used forDo I need a primary key for my table, which has a UNIQUE .Postgres and Indexes on Foreign Keys and Primary KeysWhat does PRIMARY KEY actually signify, and does my table need .Другие результаты с сайта stackoverflow.com


Do Postgres tables have to have a primary key?

solution developed using this column as a key to other RDBMSs. key and not count on default behavior of Postgres. > with no primary key set? All tables, except per (3) above. ... Re: Table with no primary key.From:"Josh Berkus" <josh(at)agliodbs(dot)com>Views:Raw Message | Whole Thread | Download mbox | Resend email

Is it mandatory to use primary key?

No, it is not required for every table to have a primary key. Whether or not a table should have a primary key is based on requirements of your database. Even though this is allowed it is bad practice because it allows for one to add duplicate rows further preventing the unique identification of rows.

Can a DB exist without primary key?

Should you create a database table without a primary key? No. Every table should have some column (or set of columns) that uniquely identifies one and only one row. It makes it much easier to maintain the data.

Is primary key mandatory for a table in SQL?

You can use UNIQUE (constraint rather than index) and NOT NULL in combination to enforce keys in SQL. Therefore, no, a primary key (or even PRIMARY KEY ) is not necessary in SQL Server.

Related Questions

Relevance
Write us your question, the answer will be received in 24 hours