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A value's datatype associates a fixed set of properties with the value.These properties cause Oracle to treat values of one datatype differently from values of another. When you create a table or cluster, you must specify a datatype for each of its columns.When you create a procedure or stored function, you must specify a datatype for each of its arguments.

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For example, value after verifying that it translates to a valid date.

Oracle provides a number of built-in datatypes as well as several categories for user-defined types that can be used as datatypes.

The syntax of Oracle datatypes appears in the diagrams that follow.

The text of this section is divided into the following sections: Character datatypes store character (alphanumeric) data, which are words and free-form text, in the database character set or national character set.

They are less restrictive than other datatypes and consequently have fewer properties.

For example, character columns can store all alphanumeric values, but columns can store only numeric values.Character data is stored in strings with byte values corresponding to one of the character sets, such as 7-bit ASCII or EBCDIC, specified when the database was created.Oracle supports both single-byte and multibyte character sets. If you insert a value that is shorter than the column length, then Oracle blank-pads the value to column length.If you try to insert a value that is too long for the column, then Oracle returns an error.The default length for a ), then you supply the column length in characters.A character is technically a codepoint of the database character set.

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