Hvordan sammenligner jeg (OG) to strenge, der repræsenterer en binær maske i mysql?

Du kan bruge conv f.eks.

select conv('1100', 2, 10) & conv('0110', 2, 10);

Re kommentar, det ser ud til at virke for mig:

mysql> select conv('1001', 2, 10) & conv('0110', 2, 10) = 0;
+-----------------------------------------------+
| conv('1001', 2, 10) & conv('0110', 2, 10) = 0 |
+-----------------------------------------------+
|                                             1 |
+-----------------------------------------------+
1 row in set (0.00 sec)

mysql> select conv('1001', 2, 10) & conv('0111', 2, 10) = 0;
+-----------------------------------------------+
| conv('1001', 2, 10) & conv('0111', 2, 10) = 0 |
+-----------------------------------------------+
|                                             0 |
+-----------------------------------------------+
1 row in set (0.00 sec)