nmsmith22389/MySQL Data Types Cheat Sheet.md

## MySQL Data Types Cheat Sheet.md

      
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              MySQL Data Types Cheat Sheet.md
            
          
    MySQL: Data Types

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

The following are the String Datatypes in MySQL:


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.
(Introduced in MySQL 4.1.2)


VARBINARY(size)
Maximum size of 255 characters.
Where size is the number of characters to store. Variable-length string.
(Introduced in MySQL 4.1.2)


Numeric Datatypes

The following are the Numeric Datatypes in MySQL:


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.


BIGINT(m)
Big integer value. Signed values range from -9223372036854775808 to 1. 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 ofdigits after the decimal.


FLOAT(m,d)
Single precision floating point number.
Where m is the total digits and d is the number ofdigits after the decimal.


DOUBLE(m,d)
Double precision floating point number.
Where m is the total digits and d is the number ofdigits after the decimal.


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 isconsidered to be TRUE.


Date/Time Datatypes

The following are the Date/Time Datatypes in MySQL:


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 MySQL:


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.
(size is optional and was introduced in MySQL 4.1)


MEDIUMBLOB
Maximum size of 16,777,215 bytes.


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


Taken from https://www.techonthenet.com/mysql/datatypes.php
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. (Introduced in MySQL 4.1.2)
`VARBINARY(size)`	Maximum size of 255 characters.	Where size is the number of characters to store. Variable-length string. (Introduced in MySQL 4.1.2)
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.
`BIGINT(m)`	Big integer value. Signed values range from -9223372036854775808 to 1. 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 ofdigits after the decimal.
`FLOAT(m,d)`	Single precision floating point number.	Where `m` is the total digits and `d` is the number ofdigits after the decimal.
`DOUBLE(m,d)`	Double precision floating point number.	Where `m` is the total digits and `d` is the number ofdigits after the decimal.
`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 isconsidered to be `TRUE`.
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.
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. (size is optional and was introduced in MySQL 4.1)
`MEDIUMBLOB`	Maximum size of 16,777,215 bytes.
`LONGTEXT`	Maximum size of 4GB or 4,294,967,295 characters.