Quick Answer: Is Varchar Same As String?

Is varchar Max bad?

Varchar(max) should only ever be used if the size of the field is known to be over 8K.

In every other instance, the size must be specified.

Failure to do so is poor design and will lead to performance issues on any but the most trivial of systems..

What is a 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.

How is varchar max stored?

So SQL Server is storing normal VARCHAR(n) columns and VARCHAR(MAX) columns “in row” by default. When VARCHAR(MAX) exceeds 8,000 characters, the pointer is stored “in row”, and the string is stored in “LOB” pages.

How long is varchar?

65535 charactersAlthough VARCHAR supports the maximum size at 65535 characters, the actual maximum value depends on other columns in the table and character set: Maximum row size is 65535 bytes in MySQL that shared among all columns in the table, except TEXT/BLOB columns.

Is varchar a text?

Some Differences Between VARCHAR and TEXT The VAR in VARCHAR means that you can set the max size to anything between 1 and 65,535. TEXT fields have a fixed max size of 65,535 characters. A VARCHAR can be part of an index whereas a TEXT field requires you to specify a prefix length, which can be part of an index.

What does varchar 100 mean?

VARCHAR is a variable length string data type, so it holds only the characters you assign to it. VARCHAR takes up 1 byte per character, + 2 bytes to hold length information. For example, if you set a VARCHAR(100) data type = ‘Jen’, then it would take up 3 bytes (for J, E, and N) plus 2 bytes, or 5 bytes in all.

Does varchar size matter?

VARCHAR stores varying length and CHAR always use the same exact size no matter the size of the string. For example, CHAR(4) will always store 4 bytes, whereas VARCHAR(4) will store up to 5 bytes.

What are the 5 types of data?

Common data types include:Integer.Floating-point number.Character.String.Boolean.

What does varchar 20 mean?

The data type of varchar is Variable-length with non-Unicode character data. The storage size is the actual length of data entered + 2 bytes. • For varchar (20): The max storage size is: 20*1 byte +2 bytes=22 bytes; •

What is varchar in 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. … It means that the total length of all columns should be less than 65,535 bytes.

What does varchar 10 mean?

The reason you use a varchar is exactly why it’s named varchar . It allows you to store variable-sized data elements. Typically, char(10) gives you ten characters, no matter what, padding it with spaces if you insert something shorter.

Why is varchar 255?

255 is used because it’s the largest number of characters that can be counted with an 8-bit number. … When used this way, VarChar only uses the number of bytes + 1 to store your text, so you might as well set it to 255, unless you want a hard limit (like 50) on the number of characters in the field.

What does varchar 50 mean?

Varchar(50) stores a maximum of 50 characters. Varchar(max) stores a maximum of 2,147,483,647 characters. But, varchar(50) keeps the 50 character space even if you don’t store 50 characters. but varchar(max) is flexible to any size.

Why do we use varchar?

VARCHAR Datatype: It is a datatype in SQL which is used to store character string of variable length but maximum of set length specified. If the length of string is less than set or fixed length then it will store as it is without padded with extra blank spaces.

What is difference between char varchar and text?

CHAR items, which are fixed length, are the fastest to store and retrieve but can waste storage space. VARCHAR, a variable-length string, can be slower to store and retrieve but does not waste storage space. TEXT is a character BLOB that requires more storage space and I/O than the other two.

What is text in SQL?

TEXT is used for large pieces of string data. If the length of the field exceeed a certain threshold, the text is stored out of row. VARCHAR is always stored in row and has a limit of 8000 characters.

How do you pronounce varchar?

Back in 1990, C keyword “char” was pronounced three ways like “Tsar”, “Care” or “Car” , Bjarne Stroustrup who invented C++ also pronounces it as “Tsar” , so you can pronounce “varchar” at least three different ways like “Var-Tsar”, “Var-Care” or “Var-Car”.

Is a varchar?

A varchar or Variable Character Field is a set of character data of indeterminate length. The term varchar refers to a data type of a field (or column) in a Database Management System which can hold letters and numbers.

What is varchar 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. … SQL varchar usually holds 1 byte per character and 2 more bytes for the length information.

What does varchar MAX mean?

varchar [ ( n | max ) ] Variable-size string data. Use n to define the string size in bytes and can be a value from 1 through 8,000 or use max to indicate a column constraint size up to a maximum storage of 2^31-1 bytes (2 GB). … The ISO synonyms for varchar are charvarying or charactervarying.

Should I use text or varchar?

TEXT has a fixed max size of 2¹⁶-1 = 65535 characters. VARCHAR has a variable max size M up to M = 2¹⁶-1 . … The other difference is, that you cannot put an index (except for a fulltext index) on a TEXT column. So if you want to have an index on the column, you have to use VARCHAR .