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Home / Database Structure / Data Types / Question No: 98

What is BIT Data Type in MySQL?

Answer No: 98

In MySQL 5 Certification Study Guide, the BIT data type is described as below:

The BIT data type represents bit-field values. BIT column specifications take a width indicating the number of bits per value, from 1 to 64 bits. The following columns store 4 and 20 bits per value, respectively:
bit_col1 BIT(4)
bit_col2 BIT(20)
For a BIT(n) column, the range of values is 0 to 2 n 1, and the storage requirement is approximately INT((n+7)/8) bytes per value.
BIT columns can be assigned values using numeric expressions. To write literal bit values in binary format, the literal-value notation b'val' can be used, where val indicates a value consisting of the binary digits 0 and 1. For example, b'1111' equals 15 and b'1000000' equals 64.

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