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GeneralRe: char(255) vs varchar(255) vs varchar(MAX) Pin
devvvy2-Feb-13 23:30
devvvy2-Feb-13 23:30 
GeneralRe: char(255) vs varchar(255) vs varchar(MAX) Pin
jschell3-Feb-13 6:36
jschell3-Feb-13 6:36 
devvvy wrote:
I think it's the opposite. CHAR don't store trailing termination char (2 bytes for SQL), varchar does


Not sure what that statement means.

The 'char' data type is fixed length. That means that there will ALWAYS be 255 characters. And the way normal APIs to databases handle that is that they pad shorter lengths with spaces. Pretty sure that is an ANSI requirement as well.

devvvy wrote:
that's why you should always use VARCHAR(n) as supposed to VARCHAR(MAX)


Unless of course you know that you will be storing data larger than the largest integer value allowed for varchar(n).

devvvy wrote:
CHAR(n) when lenght same for all/most rows.


In normal database design most columns will be varchar because
1. User data is almost always variable
2. Application data that is text almost always has a variable length.
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QuestionEncrypt a field in the database. Pin
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GeneralRe: check before insert Pin
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GeneralRe: check before insert Pin
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GeneralRe: check before insert Pin
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GeneralRe: check before insert Pin
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QuestionIdentify DML changes between two databases Pin
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GeneralRe: Update a flag based on portion of data avialble in other column Pin
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