Difference between bit tinyint smallint int and bigint datatypes in SQL Server.

Introduction:

In this article I will explain what is the difference between bit, tinyint, smallint, int and bigint datatypes in Sql Server.

Bit DataType

This datatype represents a single bit that can be 0 or 1.

tinyint DataType

This datatype represents a single byte which is used to store values from 0 to 255 (MinVal: 0, MaxVal: 255). Its storage size is 1 byte.

smallint DataType

This datatype represents a signed 16-bit integer which is used to store values from -2^15 (-32,768) through 2^15 - 1 (32,767) and its storage size is 2 bytes.
 

int DataType

This datatype represents a signed 32-bit integer which is used to store values from -2^31(-2,147,483,648) to 2 ^31-1(2,147,483,647). Its storage size is 4 bytes. 

Bigint DataType

This datatype represents a signed 64-bit integer which is used to store values from -2^63 (-9223372036854775808) through 2^63-1 (9223372036854775807). Its storage size is 8 bytes.