The maximum length of a VARCHAR in MySQL is subject to the maximum row size of 65,535 bytes, which is shared among all columns except TEXT/BLOB columns and the character set used. It means the total column should not be more than 65535 bytes.
What is the maximum length of VARCHAR?
The size of the maximum size (m) parameter of a VARCHAR column can range from 1 to 255 bytes. If you are placing an index on a VARCHAR column, the maximum size is 254 bytes. You can store character strings that are shorter, but not longer, than the m value that you specify.
Why is VARCHAR 255?
Historically, 255 characters has often been the maximum length of a VARCHAR in some DBMSes, and it sometimes still winds up being the effective maximum if you want to use UTF-8 and have the column indexed (because of index length limitations).
What does VARCHAR 500 mean?
I was doing some research on how SQL stores data on disk. MSDN states that when storring a varchar, only the length of the data itself is used plus two bytes. So, if you store “car” in a VarChar(50) it will take 5 bytes. But when you store “car” in a VarChar(500) it will also take 5 bytes.
What is the length of VARCHAR () datatype?
VARCHAR is a variable-length character data type. The default length is 80, and the maximum length is 65000 octets. For string values longer than 65000, use Long Data Types.
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; •
Does VARCHAR need length?
The answer is you don’t need to, it’s optional. It’s there if you want to ensure that strings do not exceed a certain length. From Wikipedia: Varchar fields can be of any size up to the limit.
What does varchar 100 mean?
varchar(100) means your variable FirstName can hold a value uuto hunder character, if the it is for 1000 it holds thousand characters. but unused characters do not consume storage. The storage will be n*1 byte+1= n1 bytes, in your case 100 = 100*1 byte +2 bytes=102 bytes.
Should I use text or varchar?
If something has a fixed length, we use char . If it has variable length with a well defined upper limit then use varchar . If it’s a big chunk of text that you have little control over then text would be probably your best bet.
Is it bad to use VARCHAR Max?
In my opinion, using VARCHAR(MAX) always instead of VARCHAR(N) is not a good practice. … You cannot create regular index on a VARCHAR(MAX) column. So, if you want a indexed string column then you have to go for VARCHAR(N). There is no direct way to restrict the length of the string stored in a VARCHAR(MAX) column.
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).
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.