Perform a bitwise AND operation. This function returns the result of performing a bitwise AND on all values in a given expression.
BIT_AND(expr) [over_clause]Returns the bitwise AND of all bits in expr. The calculation is performed with 64-bit (BIGINT) precision. It is an , and so can be used with the clause.
If no rows match, BIT_AND will return a value with all bits set to 1. NULL values have no effect on the result unless all results are NULL, which is treated as no match.
BIT_AND can be used as a with the addition of the over_clause.
As an :
No match:
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CREATE TABLE vals (x INT);
INSERT INTO vals VALUES(111),(110),(100);
SELECT BIT_AND(x), BIT_OR(x), BIT_XOR(x) FROM vals;
+------------+-----------+------------+
| BIT_AND(x) | BIT_OR(x) | BIT_XOR(x) |
+------------+-----------+------------+
| 100 | 111 | 101 |
+------------+-----------+------------+CREATE TABLE vals2 (category VARCHAR(1), x INT);
INSERT INTO vals2 VALUES
('a',111),('a',110),('a',100),
('b','000'),('b',001),('b',011);
SELECT category, BIT_AND(x), BIT_OR(x), BIT_XOR(x)
FROM vals GROUP BY category;
+----------+------------+-----------+------------+
| category | BIT_AND(x) | BIT_OR(x) | BIT_XOR(x) |
+----------+------------+-----------+------------+
| a | 100 | 111 | 101 |
| b | 0 | 11 | 10 |
+----------+------------+-----------+------------+SELECT BIT_AND(NULL);
+----------------------+
| BIT_AND(NULL) |
+----------------------+
| 18446744073709551615 |
+----------------------+