# Numeric Types

TiDB supports all the MySQL numeric types, including:

- Integer Types (Exact Value)
- Floating-Point Types (Approximate Value)
- Fixed-Point Types (Exact Value)

## Integer types

TiDB supports all the MySQL integer types, including `INTEGER`

/`INT`

, `TINYINT`

, `SMALLINT`

, `MEDIUMINT`

, and `BIGINT`

. For more information, see Numeric Data Type Syntax in MySQL.

The following table summarizes field descriptions:

Syntax Element | Description |
---|---|

M | the display width of the type. Optional. |

UNSIGNED | UNSIGNED. If omitted, it is SIGNED. |

ZEROFILL | If you specify ZEROFILL for a numeric column, TiDB automatically adds the UNSIGNED attribute to the column. |

The following table summarizes the required storage and range for integer types supported by TiDB:

Data Type | Storage Required (bytes) | Minimum Value (signed/unsigned) | Maximum value (signed/unsigned) |
---|---|---|---|

`TINYINT` | 1 | -128 / 0 | 127 / 255 |

`SMALLINT` | 2 | -32768 / 0 | 32767 / 65535 |

`MEDIUMINT` | 3 | -8388608 / 0 | 8388607 / 16777215 |

`INT` | 4 | -2147483648 / 0 | 2147483647 / 4294967295 |

`BIGINT` | 8 | -9223372036854775808 / 0 | 9223372036854775807 / 18446744073709551615 |

`BIT`

type

The BIT data type. A type of BIT(M) enables the storage of M-bit values. M can range from 1 to 64, with the default value of 1:

```
BIT[(M)]
```

`BOOLEAN`

type

The `BOOLEAN`

type and its alias `BOOL`

are equivalent to `TINYINT(1)`

. If the value is `0`

, it is considered as `False`

; otherwise, it is considered `True`

. As in MySQL, `True`

is `1`

and `False`

is `0`

:

```
BOOLEAN
```

`TINYINT`

type

The `TINYINT`

data type stores signed values of range [-128, 127] and unsigned values of range [0, 255]:

```
TINYINT[(M)] [UNSIGNED] [ZEROFILL]
```

`SMALLINT`

type

The `SMALLINT`

data type stores signed values of range [-32768, 32767], and unsigned values of range [0, 65535]:

```
SMALLINT[(M)] [UNSIGNED] [ZEROFILL]
```

`MEDIUMINT`

type

The `MEDIUMINT`

data type stores signed values of range [-8388608, 8388607], and unsigned values of range [0, 16777215]:

```
MEDIUMINT[(M)] [UNSIGNED] [ZEROFILL]
```

`INTEGER`

type

The `INTEGER`

type and its alias `INT`

stores signed values of range [-2147483648, 2147483647], and unsigned values of range [0, 4294967295]:

```
INT[(M)] [UNSIGNED] [ZEROFILL]
```

You can also use another form:

```
INTEGER[(M)] [UNSIGNED] [ZEROFILL]
```

`BIGINT`

type

The `BIGINT`

data type stores signed values of range [-9223372036854775808, 9223372036854775807], and unsigned values of range [0, 18446744073709551615]:

```
BIGINT[(M)] [UNSIGNED] [ZEROFILL]
```

## Floating-point types

TiDB supports all the MySQL floating-point types, including `FLOAT`

, and `DOUBLE`

. For more information, see Floating-Point Types (Approximate Value) - FLOAT, DOUBLE in MySQL.

The following table summarizes field descriptions:

Syntax Element | Description |
---|---|

M | the total number of digits |

D | the number of digits following the decimal point |

UNSIGNED | UNSIGNED. If omitted, it is SIGNED. |

ZEROFILL | If you specify ZEROFILL for a numeric column, TiDB automatically adds the UNSIGNED attribute to the column. |

The following table summarizes the required storage for floating-point types supported by TiDB:

Data Type | Storage Required (bytes) |
---|---|

`FLOAT` | 4 |

`FLOAT(p)` | If 0 <= p <= 24, it is 4; if 25 <= p <= 53, it is 8 |

`DOUBLE` | 8 |

`FLOAT`

type

The `FLOAT`

type stores a single-precision floating-point number. Permissible values are -3.402823466E+38 to -1.175494351E-38, 0, and 1.175494351E-38 to 3.402823466E+38. These are the theoretical limits, based on the IEEE standard. The actual range might be slightly smaller depending on your hardware or operating system.

`FLOAT(p)`

can be used to represent the required precision in bits. TiDB uses this value only to determine whether to use `FLOAT`

or `DOUBLE`

for the resulting data type. If p is from 0 to 24, the data type becomes FLOAT with no M or D values. If p is from 25 to 53, the data type becomes `DOUBLE`

with no M or D values. The range of the resulting column is the same as for the single-precision `FLOAT`

or double-precision `DOUBLE`

data type.

```
FLOAT[(M,D)] [UNSIGNED] [ZEROFILL]
FLOAT(p) [UNSIGNED] [ZEROFILL]
```

`DOUBLE`

type

The `DOUBLE`

type, and its alias `DOUBLE PRECISION`

stores a double-precision floating-point number. Permissible values are -1.7976931348623157E+308 to -2.2250738585072014E-308, 0, and 2.2250738585072014E-308 to 1.7976931348623157E+308. These are the theoretical limits, based on the IEEE standard. The actual range might be slightly smaller depending on your hardware or operating system.

```
DOUBLE[(M,D)] [UNSIGNED] [ZEROFILL]
DOUBLE PRECISION [(M,D)] [UNSIGNED] [ZEROFILL], REAL[(M,D)] [UNSIGNED] [ZEROFILL]
```

## Fixed-point types

TiDB supports all the MySQL floating-point types, including DECIMAL, and NUMERIC. For more information, Fixed-Point Types (Exact Value) - DECIMAL, NUMERIC in MySQL.

The meaning of the fields:

Syntax Element | Description |
---|---|

M | the total number of digits |

D | the number of digits after the decimal point |

UNSIGNED | UNSIGNED. If omitted, it is SIGNED. |

ZEROFILL | If you specify ZEROFILL for a numeric column, TiDB automatically adds the UNSIGNED attribute to the column. |

`DECIMAL`

type

`DECIMAL`

and its alias `NUMERIC`

stores a packed "exact" fixed-point number. M is the total number of digits (the precision), and D is the number of digits after the decimal point (the scale). The decimal point and (for negative numbers) the - sign are not counted in M. If D is 0, values have no decimal point or fractional part. The maximum number of digits (M) for DECIMAL is 65. The maximum number of supported decimals (D) is 30. If D is omitted, the default is 0. If M is omitted, the default is 10.

```
DECIMAL[(M[,D])] [UNSIGNED] [ZEROFILL]
NUMERIC[(M[,D])] [UNSIGNED] [ZEROFILL]
```