SQLite INTEGER data type is used to store integer values in SQLite databases. It is a fundamental data type in SQLite and is used to represent whole numbers, both positive and negative, without any decimal places.
The INTEGER data type in SQLite has a storage class of 1, which means that it is stored as a 1, 2, 3, 4, 6, or 8-byte integer depending on the magnitude of the value being stored. The size of the integer is automatically determined based on the value being stored, with smaller values requiring less space and larger values requiring more space.
SQLite supports four subtypes of the INTEGER data type:
INT: The INT subtype is a synonym for INTEGER and is used to store integers that range from -2147483648 to 2147483647.
INTEGER: The INTEGER subtype is used to store integers that range from -9223372036854775808 to 9223372036854775807.
SMALLINT: The SMALLINT subtype is used to store small integers that range from -32768 to 32767.
TINYINT: The TINYINT subtype is used to store tiny integers that range from -128 to 127.
BIGINT: The BIGINT data type is a 64-bit signed integer, which means it can store values ranging from -9223372036854775808 to 9223372036854775807.
The INTEGER data type can be used to define the PRIMARY KEY of a table in SQLite, which is a unique identifier for each row in the table. Additionally, the INTEGER data type can be used in various SQL operations such as arithmetic calculations, comparisons, and logical operations.
It is important to note that SQLite automatically converts data from one data type to another when necessary, which means that values stored as integers can be converted to other data types if needed. However, it is recommended to use the appropriate data type for each column to ensure data integrity and optimize database performance.
Example
Example of an SQLite table with an INTEGER data type column:
CREATE TABLE employee (
id INTEGER PRIMARY KEY,
name TEXT,
age INTEGER,
salary INTEGER
);
In this example, the employee table has four columns: id, name, age, and salary. The id column is defined as an INTEGER data type and also has the PRIMARY KEY constraint. The age and salary columns are also defined as INTEGER data types.
In conclusion, the INTEGER data type in SQLite is a fundamental data type used to store integer values in SQLite databases. It supports four subtypes and can be used to define the primary key of a table and in various SQL operations.