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MySQL 5.5 Reference Manual  /  ...  /  Bit-Value Type - BIT

11.2.4 Bit-Value Type - BIT

The BIT data type is used to store bit 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 9.1.5, “Bit-Value 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'.

NDB Cluster.  The maximum combined size of all BIT columns used in a given NDB table must not exceed 4096 bits.


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