NULL or '' ?

[terryds]

Hey, i want to make a description of role column in my table....

But, i don't know what's better between DEFAULT NULL or DEFAULT '' ?

Any suggestion?

[justsomeguy]

Neither is "better", if one of them was always better then there wouldn't be a choice. What matters is how you want the data in your database to be stored. If you want to use null values, then use null values, if you want to use empty strings then use empty strings.