### 11.2.4 Bit-Value Type - BIT

The `BIT`

data type is used to store bit-field
values. A type of
`BIT(``M`

)

enables
storage of `M`

-bit values.
`M`

can range from 1 to 64.

To specify bit values,
`b'``value`

'

notation
can be used. `value`

is a binary value
written using zeros and ones. For example,
`b'111'`

and `b'10000000'`

represent 7 and 128, respectively. See
Section 9.1.6, “Bit-Field Literals”.

If you assign a value to a
`BIT(``M`

)

column that
is less than `M`

bits long, the value
is padded on the left with zeros. For example, assigning a value
of `b'101'`

to a `BIT(6)`

column is, in effect, the same as assigning
`b'000101'`

.

**MySQL Cluster. **
The maximum combined size of all `BIT`

columns used in a given `NDB`

table
must not exceed 4096 bits.