What's the difference between VARCHAR and CHAR?
2009年12月11日 · VARCHAR is variable-length. CHAR is fixed length. If your content is a fixed size, you'll get better performance with CHAR. See the MySQL page on CHAR and …
What is the difference between char, nchar, varchar, and nvarchar …
2013年6月27日 · varchar [(n | max)] (character varying) Variable-length, non-Unicode string data. n defines the string length and can be a value from 1 through 8,000. max indicates that the …
What is the difference between varchar and nvarchar?
27 The main difference between Varchar(n) and nvarchar(n) is: Varchar ( Variable-length, non-Unicode character data) size is upto 8000. It is a variable length data type Used to store non …
SQL Server Text type vs. varchar data type - Stack Overflow
I have variable length character data and want to store in SQL Server (2005) database. I want to learn some best practices about how to choose TEXT SQL type or choose VARCHAR SQL …
Difference between text and varchar (character varying)
What's the difference between the text data type and the character varying (varchar) data types? According to the documentation If character varying is used without length specifier, the type ac...
What is the difference between varchar and varchar2 in Oracle?
2009年7月23日 · VARCHAR is reserved by Oracle to support distinction between NULL and an empty string in the future, as ANSI standard prescribes. VARCHAR2 does not distinguish …
sql - What does varchar (-1) mean? - Stack Overflow
2009年11月11日 · What is the meaning of varchar(-1) in SQL Server 2008? Is it an alternative for varchar(max)?
MySQL VARCHAR size? - Stack Overflow
2011年8月19日 · If I have a VARCHAR of 200 characters and that I put a string of 100 characters, will it use 200 bytes or it will just use the actual size of the string?
Maximum size of a varchar (max) variable - Stack Overflow
At any time in the past, if someone had asked me the maximum size for a varchar(max), I'd have said 2GB, or looked up a more exact figure (2^31-1, or 2147483647). However, in some …
MySQL: Why use VARCHAR(20) instead of VARCHAR(255)?
2009年8月12日 · Possible values are 1-255. But what are its advantages if you use VARCHAR (255) that is the maximum instead of VARCHAR (20)? As far as I know, the size of the entries …