Data Type Comparison (Oracle and MySQL)

Whenever you work Database design, Database Migration, You should be aware about data type, Storage required by data type.   Whenever you work on migration, you should know the equivalent data type between existing definitions.

Below is the quick comparison of Oracle Data type with MySQL Data type.

Default Data Type Mappings

MySQL Data Type	Oracle Data Type
BIGINT	NUMBER(19, 0)
BIT	RAW
BLOB	BLOB, RAW
CHAR	CHAR
DATE	DATE
DATETIME	DATE
DECIMAL	FLOAT (24)
DOUBLE	FLOAT (24)
DOUBLE PRECISION	FLOAT (24)
ENUM	VARCHAR2
FLOAT	FLOAT
INT	NUMBER(10, 0)
INTEGER	NUMBER(10, 0)
LONGBLOB	BLOB, RAW
LONGTEXT	CLOB, RAW
MEDIUMBLOB	BLOB, RAW
MEDIUMINT	NUMBER(7, 0)
MEDIUMTEXT	CLOB, RAW
NUMERIC	NUMBER
REAL	FLOAT (24)
SET	VARCHAR2
SMALLINT	NUMBER(5, 0)
TEXT	VARCHAR2, CLOB
TIME	DATE
TIMESTAMP	DATE
TINYBLOB	RAW
TINYINT	NUMBER(3, 0)
TINYTEXT	VARCHAR2
VARCHAR	VARCHAR2, CLOB
YEAR	NUMBER

Numeric Types

MySQL	Size	Oracle
BIGINT	8 Bytes	NUMBER (19,0)
BIT	approximately (M+7)/8 Bytes	RAW
DECIMAL(M,D)	M+2 bytes if D > 0, M+1 bytes if D = 0 (D+2, if M < D)	FLOAT(24), BINARY_FLOAT
DOUBLE	8 Bytes	FLOAT(24), BINARY_FLOAT, BINARY_DOUBLE
DOUBLE PRECION	8 Bytes	FLOAT(24), BINARY_DOUBLE
FLOAT(25<=X <=53)	8 Bytes	FLOAT(24), BINARY_FLOAT
FLOAT(X<=24)	4 Bytes	FLOAT, BINARY_FLOAT
INT	4 Bytes	NUMBER (10,0)
INTEGER	4 Bytes	NUMBER (10,0)
MEDIUMINT	3 Bytes	NUMBER (7,0)
NUMERIC	M+2 bytes if D > 0, M+1 bytes if D = 0 (D+2, if M < D)	NUMBER
REAL	8 Bytes	FLOAT(24), BINARY_FLOAT
SMALLINT	2 Bytes	NUMBER(5,0)
TINYINT	1 Byte	NUMBER(3,0)

Date and Time Types

MySQL	Size	Oracle
DATE	3 Bytes	DATE
DATETIME	8 Bytes	DATE
TIMESTAMP	4 Bytes	DATE
TIME	3 Bytes	DATE
YEAR	1 Byte	NUMBER

String Types

MySQL	Size	Oracle
BLOB	L + 2 Bytes whereas L<2^16	RAW, BLOB
CHAR(m)	M Bytes, 0<=M<=255	CHAR
ENUM (VALUE1, VALUE2, ...)	1 or 2 Bytes depending on the number of enum. values (65535 values max)
LONGBLOB	L + 4 Bytes whereas L < 2 ^ 32	RAW, BLOB
LONGTEXT	L + 4 Bytes whereas L < 2 ^ 32	RAW, CLOB
MEDIUMBLOB	L + 3 Bytes whereas L < 2^ 24	RAW, BLOB
MEDIUMTEXT	L + 3 Bytes whereas L < 2^ 24	RAW, CLOB
SET (VALUE1, VALUE2, ...)	1, 2, 3, 4 or 8 Bytes depending on the number of set members (64 members maximum)
TEXT	L + 2 Bytes whereas L<2^16	VARCHAR2, CLOB
TINYBLOB	L + 1 Bytes whereas L<2 ^8	RAW, BLOB
TINYTEXT	L + 1 Bytes whereas L<2 ^8	VARCHAR2
VARCHAR(m)	L+1 Bytes whereas L<=M and0<=M<=255 before MySQL 5.0.3 (0 <= M <= 65535 in MySQL 5.0.3 and later; effective maximum length is 65,532 bytes)	VARCHAR2, CLOB