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MySQL DataTypes CheatSheet (#29)
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| --- | ||
| title: "MySQL: Data Types" | ||
| date: 2024-12-03 06:30:00 +0000 | ||
| categories: databases | ||
| tags: bdd databases sql | ||
| author: mdevoldere | ||
| --- | ||
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| ## String Datatypes | ||
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| The following are the **String Datatypes** in MySQL: | ||
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| | 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.<br>(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.<br>(Introduced in MySQL 4.1.2) | | ||
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| ## Numeric Datatypes | ||
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| The following are the **Numeric Datatypes** in MySQL: | ||
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| | 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`. | | ||
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| ## Date/Time Datatypes | ||
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| The following are the **Date/Time Datatypes** in MySQL: | ||
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| | 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. | | ||
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| ## Large Object (LOB) Datatypes | ||
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| The following are the **LOB Datatypes** in MySQL: | ||
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| | 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.<br>*(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. | |