Is it OK to use a NOT NULL on a primary key in SQLite?

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Is it OK to use a NOT NULL on a primary key in SQLite?

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#1 by (6 votes)

1

My question is, is it correct to define as NOT NULL in a primary call in a database SQLite for Android ?, example:

ID INTEGER NOT NULL PRIMARY KEY

android android-studio sqlite

asked by Jorge Luis Pilo Torres 30.08.2016 в 16:09

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1 answer

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score 6 · Accepted Answer

In SQLite (and other databases), if you declare a field as Primary Key it is necessary that it is set as NOT NULL , since you never must have null values

Although in SQLite if you declare your field as Primary Key , they are automatically set to NOT NULL .

create table Personas (
  P_Id number primary key,
  LastName varchar(255),
  FirstName varchar(255) not null
);