What does VARCHAR2 10 mean?

VARCHAR2(10 char) could support as much as 40 bytes of information and will support to up 10 characters of data. Varchar2(10) uses the current value of NLS_LENGTH_SEMANTICS to determine the limit for the string. incase of byte, then it’s 10 bytes. incase of char, then it’s 10 characters.

What is VARCHAR2 example?

The VARCHAR2 datatype stores variable-length character strings. When you create a table with a VARCHAR2 column, you specify a maximum column length (in bytes, not characters) between 1 and 2000 for the VARCHAR2 column.

What is the VARCHAR2 maximum size in Oracle?

4000 bytes
Maximum size is 4000 bytes or characters, and minimum is 1 byte or 1 character. You must specify size for VARCHAR2 . BYTE indicates that the column will have byte length semantics; CHAR indicates that the column will have character semantics.

What is the meaning of VARCHAR2?

Variable Character 2
VarChar/VarChar2 stands for Variable Character. 2. It is used to store character string of fixed length. It is used to store character string of variable length.

Why varchar is used in SQL?

In practical scenarios, varchar(n) is used to store variable length value as a string, here ‘n’ denotes the string length in bytes and it can go up to 8000 characters. As a quick fix, we can alter the table and increase the data type of the SQL varchar column, say to varchar(50) to insert the new row.

Should I use VARCHAR or VARCHAR2?

VARCHAR is reserved by Oracle to support distinction between NULL and empty string in future, as ANSI standard prescribes. VARCHAR2 does not distinguish between a NULL and empty string, and never will. If you rely on empty string and NULL being the same thing, you should use VARCHAR2 .

Why VARCHAR is used in SQL?

Is VARCHAR a string?

Also known as Variable Character, it is an indeterminate length string data type. It can hold numbers, letters and special characters. Microsoft SQL Server 2008 (and above) can store up to 8000 characters as the maximum length of the string using varchar data type.

What is CLOB type?

Stands for “Character Large Object.” A CLOB is a data type used by various database management systems, including Oracle and DB2. It stores large amounts of character data, up to 4 GB in size. Common data types used for storing character data include char, varchar, and text. …

What is difference between char and VARCHAR?

Storage size of VARCHAR datatype is equal to the actual length of the entered string in bytes….Difference between CHAR and VARCHAR dataypes.

Which is faster CHAR or VARCHAR?

VARCHAR is used to store variable length character strings up to 4000 characters. But, remember CHAR is faster than VARCHAR – some times up to 50% faster.

Which is the data type synonymous with varchar?

Although the VARCHAR data type is currently synonymous with VARCHAR2, the VARCHAR data type is scheduled to be redefined as a separate data type used for variable-length character strings compared with different comparison semantics. Currently, VARCHAR is synonymous with VARCHAR2.

What’s the difference between varchar-1 and varchars-2?

-1 VARCHAR can store up to 2000 bytes of characters while VARCHAR2 can store up to 4000 bytes of characters. If we declare datatype as VARCHAR then it will occupy space for NULL values. In the case of VARCHAR2 datatype, it will not occupy any space for NULL values.

How big is a 10 byte VARCHAR2 file?

The VARCHAR2 and CHAR types support two methods of specifying lengths: In bytes: VARCHAR2 (10 byte). This will support up to 10 bytes of data, which could be as few as two characters in a multi-byte character sets. In characters: VARCHAR2 (10 char). This will support to up 10 characters of data, which could be as much as 40 bytes of information.

Which is safer to use varchar or varcha2?

If and when that happens, the semantics of the VARCHAR2 data type will remain the same. Using the VARCHAR2 data type is safer because you don’t have to worry that some future version of Oracle will break your code by causing empty strings to no longer be considered NULL.