Bit functions
This topic describes the bit functions that are supported by PolarDB-X.
Bit functions are classified into two types: scalar function and aggregate function.
Scalar functions supported by PolarDB-X
| Function | Description |
|---|---|
| | | The bitwise OR operator. |
| \^ | The bitwise exclusive OR (XOR) operator. |
| \& | The bitwise AND operator. |
| BIT_COUNT() | Returns the number of 1s in the binary representation of a number. |
Aggregate functions supported by PolarDB-X
| Function | Description |
|---|---|
| BIT_OR() | The bitwise OR operator. |
| BIT_XOR() | The bitwise XOR operator. |
| BIT_AND() | The bitwise AND operator. |
Example
The function returns the number of 1s in the binary representation of a number. The function returns NULL if the argument of the function is NULL.
mysql> SELECT BIT_COUNT(29), BIT_COUNT(b'101010');
+--------------+----------------------+
| BIT_COUNT(29) | BIT_COUNT(b'101010') |
+--------------+----------------------+
| 4 | 3 |
+--------------+----------------------+
1 row in set (0.00 sec)
mysql> SELECT BIT_COUNT(NULL);
+-----------------+
| BIT_COUNT(NULL) |
+-----------------+
| NULL |
+-----------------+
1 row in set (0.00 sec)
mysql> SELECT 3 & 2;
+-------+
| 3 & 2 |
+-------+
| 2 |
+-------+
1 row in set (0.01 sec)