- How long is varchar?
- What is text data type?
- Which is better Nvarchar or varchar?
- What is text in MySQL?
- What is text data type in MySQL?
- What is the difference between text and varchar?
- When should I use varchar?
- What does varchar 255 mean?
- What does varchar 30 mean?
- Does varchar reserve space?
- Which is better varchar or text in mysql?
- Why would you use char instead of varchar?
- Why is varchar 255?
- Is varchar a string?
- Does varchar size matter?
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..
What is text data type?
The TEXT data type stores any kind of text data. It can contain both single-byte and multibyte characters that the locale supports. The term simple large object refers to an instance of a TEXT or BYTE data type. No more than 195 columns of the same table can be declared as TEXT data types. …
Which is better Nvarchar or varchar?
The key difference between varchar and nvarchar is the way they are stored, varchar is stored as regular 8-bit data(1 byte per character) and nvarchar stores data at 2 bytes per character. Due to this reason, nvarchar can hold upto 4000 characters and it takes double the space as SQL varchar.
What is text in MySQL?
MySQL TEXT is a standard data type for storing special character strings with maximum sizes or as defined. On the ordering of its character set, the evaluations and sorting are built. In actual, this TEXT data type for a column is composed of four categories. They are TINYTEXT, TEXT, MEDIUMTEXT, LONGTEXT.
What is text data type in MySQL?
TEXT is the family of column type intended as high-capacity character storage. The actual TEXT column type is of four types-TINYTEXT, TEXT, MEDIUMTEXT and LONGTEXT. The four TEXT types are very similar to each other; the only difference is the maximum amount of data each can store.
What is the difference between text and varchar?
TEXT has a fixed max size of 2¹⁶-1 = 65535 characters. VARCHAR has a variable max size M up to M = 2¹⁶-1 . So you cannot choose the size of TEXT but you can for a VARCHAR . The other difference is, that you cannot put an index (except for a fulltext index) on a TEXT column.
When should I use varchar?
If you use char or varchar, we recommend to:Use char when the sizes of the column data entries are consistent.Use varchar when the sizes of the column data entries vary considerably.Use varchar(max) when the sizes of the column data entries vary considerably, and the string length might exceed 8,000 bytes.
What does varchar 255 mean?
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 30 mean?
The CHAR and VARCHAR types are declared with a length that indicates the maximum number of characters you want to store. For example, CHAR(30) can hold up to 30 characters. The length of a CHAR column is fixed to the length that you declare when you create the table. The length can be any value from 0 to 255.
Does varchar reserve space?
Even though the column is variable and the storage space used is variable, MySQL will allocate memory in fixed-chunks to store values. For example varchar(200) will use more memory that varchar(5). This is not a storage space issue, but still something to consider when defining your columns.
Which is better varchar or text in mysql?
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. … VARCHAR is stored inline with the table (at least for the MyISAM storage engine), making it potentially faster when the size is reasonable.
Why would you use char instead of varchar?
CHAR is a fixed length field; VARCHAR is a variable length field. If you are storing strings with a wildly variable length such as names, then use a VARCHAR, if the length is always the same, then use a CHAR because it is slightly more size-efficient, and also slightly faster.
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.
Is varchar a string?
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.
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.