sql-server-2008 - varchar(max) 有多少个字符？

Question

当数据类型为 VARCHAR(MAX) 时，SQL Server 2008 数据库字段可以包含多少个字符？

Answer 1

来自http://msdn.microsoft.com/en-us/library/ms176089.aspx

varchar [ ( n | max ) ] Variable-length, non-Unicode character data. n can be a value from 1 through 8,000. max indicates that the maximum storage size is 2^31-1 bytes. The storage size is the actual length of data entered + 2 bytes. The data entered can be 0 characters in length. The ISO synonyms for varchar are char varying or character varying.

1 个字符 = 1 个字节。并且不要忘记 2 个字节作为终止符。因此，2^31-3 个字符。