When you create a VARCHAR2 column, you supply the maximum number of bytes or characters of data that it can hold. The VARCHAR2 data type specifies a variable-length character string. When you create a table with an NVARCHAR2 column, you supply the maximum number of characters it can hold.ģ2767 bytes if MAX_STRING_SIZE = EXTENDED The NVARCHAR2 data type is a Unicode-only data type. The maximum column size allowed is 2000 bytes. When you create a table with an NCHAR column, you define the column length in characters. The NCHAR data type is a Unicode-only data type. Following data types are used for character data : If you insert a value that is shorter than the column length, then Oracle blank-pads the value to column length and if the value is too long for the column, then Oracle returns an error. The CHAR data type specifies a fixed-length character string. Stores national character set data.Ĭontains a locator to a large binary file stored outside the database. Maximum size is (4 gigabytes - 1) * (database block size). Maximum size is (4 gigabytes - 1) * (database block size).Ī character large object containing Unicode characters. Default and minimum size is 1 character.Ī character large object containing single-byte or multibyte characters. Maximum size is determined by the national character set definition, with an upper limit of 2000 bytes. The number of bytes can be up to two times size for AL16UTF16 encoding and three times size for UTF8 encoding. Default and minimum size is 1 byte.įixed-length character data of length size characters. Maximum size is 2000 bytes or characters. The maximum size and default is 4000 bytes.įixed-length character data of length size bytes or characters. The logical address of a row (base 64 string representing) of an index-organized table. The unique address (base 64 string representing) of a row in its table. Stores a period of time in days, hours, minutes, and seconds, whereĭay_precision is the maximum number of digits in the DAY datetime field. Stores a period of time in years and months, where year_precision is the number of digits in the YEAR datetime field.Īccepted values are 0 to 9. It has fractional seconds and an explicit time zone. This data type contains the datetime fields YEAR, MONTH, DAY, HOUR, MINUTE, SECOND, TIMEZONE_HOUR, and TIMEZONE_MINUTE. The size is 7 or 11 bytes, depending on the precision. It contains fractional seconds but does not have a time zone. This data type contains the datetime fields YEAR, MONTH, DAY, HOUR, MINUTE, and SECOND. The default format is determined explicitly by the NLS_DATE_FORMAT parameter or implicitly by the NLS_TERRITORY parameter. Valid date range : From JanuBC, to DecemAD. Range of p : From 1 to 126 binary digits.Ī FLOAT value requires from 1 to 22 bytes.Ĭharacter data of variable length up to 2 gigabytes, used for backward compatibility. You must specify size for NVARCHAR2.īoth precision and scale are in decimal digits.Ī NUMBER value requires from 1 to 22 bytes.Ī FLOAT value is represented internally as NUMBER. Maximum size is determined by the national character set definition, with an upper limit of 4000 bytes. Variable-length Unicode character string having maximum length size characters.
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