What is VARCHAR2 in SQL?

The VARCHAR2 data type specifies a variable-length character string in the database character set. You specify the database character set when you create your database. When you create a table with a VARCHAR2 column, you must specify the column length as size optionally followed by a length qualifier.

What is VARCHAR and VARCHAR2 in SQL?

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. e.g., name varchar(10)

What is VARCHAR2 in Oracle SQL?

Introduction to Oracle VARCHAR2 data type

To store variable-length character strings, you use the Oracle VARCHAR2 data type. A VARCHAR2 column can store a value that ranges from 1 to 4000 bytes. It means that for a single-byte character set, you can store up to 4000 characters in a VARCHAR2 column.

What is VARCHAR2 datatype?

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.

Why do we write VARCHAR2 in SQL?

The VARCHAR2 data type is used to store variable length strings. This means that you define a maximum size, and the strings that you insert into the column will be stored as they are provided. No spaces will be added to the character, like the CHAR datatype. The maximum length of a VARCHAR2 data type is 4000 bytes.

What is difference between varchar and varchar2 datatype?

What is VARCHAR2?

The VARCHAR2 data type specifies a variable-length character string in the database character set. You specify the database character set when you create your database. When you create a table with a VARCHAR2 column, you must specify the column length as size optionally followed by a length qualifier.

What is VARCHAR2 in MySQL?

Oracle recommends that you use VARCHAR2 rather than VARCHAR. In the future, VARCHAR might be defined as a separate data type used for variable-length character strings compared with different comparison semantics. The maximum size is 4000 and the minimum of 1 is the default.

What is the size of VARCHAR2?

The maximum length for VARCHAR2 is 32672 BYTE or 8168 CHAR which is the same as the maximum length for VARCHAR of 32672 OCTETS or 8168 CODEUNITS32.

Why we use VARCHAR2 instead of VARCHAR?

Both Varchar and Varchar2 are data types to store character strings for particular column (field) in databases. These are reserved by ORACLE. If we relay empty string and NULL being the same, then we should use varchar2 instead of varchar. Because it treats both null and empty strings as same.

What is a VARCHAR in SQL?

So what is varchar in SQL? As the name suggests, varchar means character data that is varying. Also known as Variable Character, it is an indeterminate length string data type. It can hold numbers, letters and special characters.

What is the difference between VARCHAR2 and number data type?

The biggest reason is that when stored in a VARCHAR2 datatype, you can retain your leading zeros, whereas in a NUMBER datatype, you cannot. For instance, many zip codes on the east coast start with a zero.

How many characters can VARCHAR2 hold in Oracle?

VARCHAR2(15 BYTE) – the column can hold string of up to 15 bytes, VARCHAR2(15 CHAR) – the column can hold string of up to 15 characters, simply VARCHAR2(15) – the semantics depend on the value of the NLS_LENGTH_SEMANTICS parameter of the session creating the table. By default yout table is created with byte semantics.

What is Nvarchar in SQL Server?

The NVARCHAR data type stores character data in a variable-length field. Data can be a string of single-byte or multibyte letters, digits, and other characters that are supported by the code set of your database locale.

What is difference between CHAR and VARCHAR and nvarchar in SQL?

char and nchar are fixed-length which will reserve storage space for number of characters you specify even if you don't use up all that space. varchar and nvarchar are variable-length which will only use up spaces for the characters you store. It will not reserve storage like char or nchar .

What is VARCHAR MySQL?

MySQL VARCHAR is the variable-length string whose length can be up to 65,535. MySQL stores a VARCHAR value as a 1-byte or 2-byte length prefix plus actual data. The length prefix specifies the number of bytes in the value.

What does VARCHAR 255 mean?

Now, how does VARCHAR work? If you specify it as VARCHAR(255), that means that the column will reserve 1 byte + length of the string bytes. That 1 byte indicates how long the string is. 1 byte = you can have from 0 - 255 values stored (2 to the power of 8 = 256).

What does VARCHAR 10 mean?

To give you an example, CHAR(10) is a fixed-length non-Unicode string of length 10, while VARCHAR(10) is a variable-length non-Unicode string with a maximum length of 10. This means the actual length will depend upon the data.

What is VARCHAR value?

Values in VARCHAR columns are variable-length strings. The length can be specified as a value from 0 to 65,535. The effective maximum length of a VARCHAR is subject to the maximum row size (65,535 bytes, which is shared among all columns) and the character set used.

What are SQL data types?

What does VARCHAR 25 represent?

What does VARCHAR(25) represent? Answer: A character string up to 25 characters long.

What VARCHAR2 100?

A VARCHAR2(100 CHAR) column in an AL32UTF8 database would be internally defined as having the width of 400 bytes. It holds up to any 100 Unicode characters. The above implies that the CHAR limit works optimally if it is lower than 4000/mchw.

What is a character in SQL?

A character or string function is a function which takes one or more characters or numbers as parameters and returns a character value. Basic string functions offer a number of capabilities and return a string value as a result set.

What is the difference between CHAR and VARCHAR data type in Oracle SQL?

The difference between a CHAR and a VARCHAR is that a CHAR(n) will ALWAYS be N bytes long, it will be blank padded upon insert to ensure this. A varchar2(n) on the other hand will be 1 to N bytes long, it will NOT be blank padded. Using a CHAR on a varying width field can be a pain due to the search semantics of CHAR.