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MariaDB : Data Types

Tutorial by:      Date: 2016-04-18 05:36:02

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The following is a list of datatypes available in MariaDB, which includes string, numeric, date/time, and large object datatypes.

String Datatypes

The following are the String Datatypes in MariaDB:

Data Type Syntax

Maximum Size

Explanation

CHAR(size)

Maximum size of 255 characters.

Where size is the number of characters to store. Fixed-length strings. Space padded on right to equal size characters.

VARCHAR(size)

Maximum size of 255 characters.

Where size is the number of characters to store. Variable-length string.

TINYTEXT(size)

Maximum size of 255 characters.

Where size is the number of characters to store.

TEXT(size)

Maximum size of 65,535 characters.

Where size is the number of characters to store.

MEDIUMTEXT(size)

Maximum size of 16,777,215 characters.

Where size is the number of characters to store.

LONGTEXT(size)

Maximum size of 4GB or 4,294,967,295 characters.

Where size is the number of characters to store.

BINARY(size)

Maximum size of 255 characters.

Where size is the number of binary characters to store. Fixed-length strings. Space padded on right to equal size characters.

VARBINARY(size)

Maximum size of 255 characters.

Where size is the number of characters to store. Variable-length string.

Numeric Datatypes

The following are the Numeric Datatypes in MariaDB:

Data Type Syntax

Maximum Size

Explanation

BIT

Very small integer value that is equivalent to TINYINT(1).
Signed values range from -128 to 127. Unsigned values range from 0 to 255.

 

TINYINT(m)

Very small integer value.
Signed values range from -128 to 127. Unsigned values range from 0 to 255.

 

SMALLINT(m)

Small integer value.
Signed values range from -32768 to 32767. Unsigned values range from 0 to 65535.

 

MEDIUMINT(m)

Medium integer value.
Signed values range from -8388608 to 8388607. Unsigned values range from 0 to 16777215.

 

INT(m)

Standard integer value.
Signed values range from -2147483648 to 2147483647. Unsigned values range from 0 to 4294967295.

 

INTEGER(m)

Standard integer value.
Signed values range from -2147483648 to 2147483647. Unsigned values range from 0 to 4294967295.

This is a synonym for the INT datatype.

BIGINT(m)

Big integer value.
Signed values range from -9223372036854775808 to 9223372036854775807. Unsigned values range from 0 to 18446744073709551615.

 

DECIMAL(m,d)

Unpacked fixed point number.
m defaults to 10, if not specified.
d defaults to 0, if not specified.

Where m is the total digits and d is the number of digits after the decimal.

DEC(m,d)

Unpacked fixed point number.
m defaults to 10, if not specified.
d defaults to 0, if not specified.

Where m is the total digits and d is the number of digits after the decimal.

This is a synonym for the DECIMAL datatype.

NUMERIC(m,d)

Unpacked fixed-point number.
m defaults to 10, if not specified.
d defaults to 0, if not specified.

Where m is the total digits and d is the number of digits after the decimal.

This is a synonym for the DECIMAL datatype.

FIXED(m,d)

Unpacked fixed-point number.
m defaults to 10, if not specified.
d defaults to 0, if not specified.

Where m is the total digits and d is the number of digits after the decimal.

This is a synonym for the DECIMAL datatype.

FLOAT(m,d)

Single precision floating point number.

Where m is the total digits and d is the number of digits after the decimal.

DOUBLE(m,d)

Double precision floating point number.

Where m is the total digits and d is the number of digits after the decimal.

DOUBLE PRECISION(m,d)

Double precision floating point number.

Where m is the total digits and d is the number of digits after the decimal.

This is a synonym for the DOUBLE datatype.

REAL(m,d)

Double precision floating point number.

Where m is the total digits and d is the number of digits after the decimal.

This is a synonym for the DOUBLE datatype.

FLOAT(p)

Floating point number.

Where p is the precision.

BOOL

Synonym for TINYINT(1)

Treated as a boolean data type where a value of 0 is considered to be FALSE and any other value is considered to be TRUE.

BOOLEAN

Synonym for TINYINT(1)

Treated as a boolean data type where a value of 0 is considered to be FALSE and any other value is considered to be TRUE.

Date/Time Datatypes

The following are the Date/Time Datatypes in MariaDB:

Data Type Syntax

Maximum Size

Explanation

DATE

Values range from '1000-01-01' to '9999-12-31'.

Displayed as 'YYYY-MM-DD'.

DATETIME

Values range from '1000-01-01 00:00:00' to '9999-12-31 23:59:59'.

Displayed as 'YYYY-MM-DD HH:MM:SS'.

TIMESTAMP(m)

Values range from '1970-01-01 00:00:01' UTC to '2038-01-19 03:14:07' UTC.

Displayed as 'YYYY-MM-DD HH:MM:SS'.

TIME

Values range from '-838:59:59' to '838:59:59'.

Displayed as 'HH:MM:SS'.

YEAR[(2|4)]

Year value as 2 digits or 4 digits.

Default is 4 digits.

Large Object (LOB) Datatypes

The following are the LOB Datatypes in MariaDB:

Data Type Syntax

Maximum Size

Explanation

TINYBLOB

Maximum size of 255 bytes.

 

BLOB(size)

Maximum size of 65,535 bytes.

Where size is the number of characters to store

MEDIUMBLOB

Maximum size of 16,777,215 bytes.

 

LONGTEXT

Maximum size of 4GB or 4,294,967,295 characters.

 

 

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