Oracle Common Data type description

Type	Meaning	Storage description	Note
CHAR	Fixed-length strings	Maximum length 2000bytes
VARCHAR2	Variable-length strings ,	Maximum length 4000bytes	Maximum length of index can be made 749
NCHAR	Fixed-length strings based on character set	Maximum length 2000bytes
NVARCHAR2	Variable-length strings based on character set	Maximum length 4000bytes
DATE	Date (Day - month - year)	Dd-mm-yy (HH-MI-SS), after rigorous testing, no problem of thousand worms
timestamp	date (Day - month - year)	dd-mm-yy (HH-MI-SS:FF3), after rigorous testing, no bug problem	date Compare, timestamp have decimal seconds information
LONG	Super Long string	Maximum length 2G, enough to store tome
RAW	Fixed-length binary data	Maximum length 2000bytes	can store multimedia image sound, etc.
LONG RAW	Variable-length binary data	Maximum length 2G	can store multimedia image sound, etc.
Blob	Binary data	Maximum length 4G
Clob	Character data	Maximum length 4G
NCLOB	Character data based on the character set	Maximum length 4G
BFILE	Binary data stored outside the database	Maximum length 4G
ROWID	Unique line number recorded in the datasheet	10bytes	. ****.**** format,* is 0 or 1
Nrowid	Unique line number recorded in a Binary data table	Maximum length 4000bytes
Number (P,s)	Number Type	P is the integer digit,S is the decimal digit
DECIMAL (P,s)	Number Type	P is the integer digit,S is the decimal digit
INTEGER	Integer type	A small integer
FLOAT	Floating-point type	Number (+), double precision
REAL	Real type	Number (+), higher accuracy

 

Oracle Common Data type description