Яка різниця між char і VARCHAR?

What is char and VARCHAR?

Char and Varchar are two data types used widely in SQL servers. The main difference is that Char stores fixed-length character strings, and Varchar stores character strings of variable lengths.

What does VARCHAR 128 mean?

It means you have a varchar2 which is 128 characters long!

Why would you use char instead of VARCHAR?

CHAR columns are fixed in size, while VARCHAR and VARCHAR(MAX) columns support variable-length data. CHAR columns should be used for columns that vary little in length. String values that vary significantly in length and are no longer than 8,000 bytes should be stored in a VARCHAR column.

What is the character limit for VARCHAR?

0 to 65,535 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.

VARCHAR is variable-length. CHAR is fixed length. If your content is a fixed size, you’ll get better performance with CHAR.
Because CHAR is fixed length while VARCHAR is not so there’s really no benefit to keeping CHAR over VARCHAR correct? Is there any situation …
Кожен символ varchar займає 1 байт пам’яті і може представляти 256 різних символів. Кожен символ nvarchar займає 2 байти пам’яті і може …