What is the maximum size you can provide for character columns?
The length of a CHAR column is fixed to the length that you declare when you create the table. The length can be any value from 0 to 255. When CHAR values are stored, they are right-padded with spaces to the specified length.
What is the length of VARCHAR?
The size of the maximum size (m) parameter of a VARCHAR column can range from 1 to 255 bytes. If you are placing an index on a VARCHAR column, the maximum size is 254 bytes. You can store character strings that are shorter, but not longer, than the m value that you specify.
Is it possible using Max on a CHAR column?
YES.
Which is better CHAR or VARCHAR?
CHAR is a fixed length field; VARCHAR is a variable length field. If you are storing strings with a wildly variable length such as names, then use a VARCHAR, if the length is always the same, then use a CHAR because it is slightly more size-efficient, and also slightly faster.
What is the difference between VARCHAR and VARCHAR2?
The main difference is that VARCHAR is ANSI Standard and VARCHAR2 is Oracle standard. The VarChar2 data type is used to store the character values. It is a variable-length data type i.e we can change the size of the character variable at execution time. Hence, it is also called a Dynamic datatype.
What is the difference between CHAR VARCHAR and VARCHAR2 data types on Oracle?
The difference between a CHAR and a VARCHAR is that a CHAR(n) will ALWAYS be N bytes long, it will be blank padded upon insert to ensure this. A varchar2(n) on the other hand will be 1 to N bytes long, it will NOT be blank padded. Using a CHAR on a varying width field can be a pain due to the search semantics of CHAR.
Is VARCHAR or char better?
Because of the fixed field lengths, data is pulled straight from the column without doing any data manipulation and index lookups against varchar are slower than that of char fields. CHAR is better than VARCHAR performance wise, however, it takes unnecessary memory space when the data does not have a fixed-length.
What is the size of VARCHAR?
What is the difference between CHAR and VARCHAR data type in Oracle SQL?