postgresql 9.2中varchar（n）的最大长度是多少，哪个最好使用varchar（n）或text？

Hi I am using postgresql 9.2 and I want to use varchar(n) to store some long string but I don't know the maximum length of character which varchar(n) supports. and which one is better to use so could you please suggest me? thanksHi I am using postgresql 9.2 and I want to use