• Register
110,660 points
12 7 5

Key difference: Varchar and Varchar2 on do data type in Oracle. Varchar ignites variable-length character string. They are used to store rope. Varchar2 can store a string of c

Contents:

 

 Key difference: Varchar and Varchar2 are two data types in Oracle. Varchar stands for variable length character string. They are used to store ropes. Varchar2 can store a variable-length character string with an upper limit of 4000 bytes. Varchar is the same as Varchar2. However, it has been scheduled to be redefined in the future and therefore it is not recommended to use the Varchar data type in the current scenario.

 

Varchar2 means variable length character string2. In Oracle, this data type is used to store a variable-length character string. If a table is created with a column defined by a Varchar2 data type, then in that case a maximum string length between 1 and 4000 bytes can be specified for that particular column. However, if a value that exceeds the maximum length of the column is inserted into that column, then the Oracle database generates an error. If a column in the table is marked as Varchar2 (data type) with a maximum size of 30 characters. If in a single-byte character set, only 5 characters are defined in that column as a value for a particular row. So only 5 characters will be stored.

 

Varchar is also considered synonymous with Varchar2. Currently, Varchar behaves exactly the same as Varchar2. However, using Varchar is not recommended as this can lead to possible behavior changes in the future. Varchar has been used to reserve the space for future use. Varchar and Varchar2 save table space. It is always recommended to use Varchar2 instead of Varchar.

The Oracle documentation for 10G Release 2 clearly states:

"Do not use the VARCHAR data type. Use the VARCHAR2 data type instead. Although the VARCHAR data type is currently synonymous with VARCHAR2, the VARCHAR data type is programmed to be redefined as a separate data type used for strings of variable-length characters compared to different comparison semantics. "

Comparison between Varchar and Varchar2:

 

 

 

 
Varchar

Varchar2

 

Full form

 

Variable-length character string

 

Variable-length character string2

 

Definition

 

At Oracle, it is not currently recommended for use. VARCHAR could be defined as a separate data type for variable length character strings in the future.

In Oracle, this data type is used to store a variable-length character string with a maximum of 4000 bytes.

 

Maximum SQL length

4000

 

4000

   

 

 

110,660 points
12 7 5