MySQL bit_and()函数

BIT_AND(expression)

BIT_AND函数返回表达式的所有位按位AND结果。 基本的前提是,如果两个对应位是相同的, 然后按位与运算将返回1,如果它们是不同的,按位与运算将返回0。函数本身返回一个64位的整数值。如果没有匹配,那么它将返回18446744073709551615。下面的例子执行BIT_AND函数由列表中MAKER来分组PRICE 列:

mysql> SELECT 
          MAKER, BIT_AND(PRICE) BITS
          FROM CARS GROUP BY MAKER
+---------------------------------------------------------+
|MAKER           BITS                                     |
+---------------------------------------------------------+
|CHRYSLER        512                                      |
|FORD            12488                                    |
|HONDA           2144                                     |
+---------------------------------------------------------+
1 row in set (0.00 sec)

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