如果在MYSQL中使用按位运算，性能会变差吗？

Question

There are several boolean columns in one table. For convenience in my code, I want to use one column to replace all of them. In the new column, each bit represents an original boolean column. But if I do like this, I must do bitwise operation in the where clause, so I can't use index for it.

Will the performance be worse if bitwise operations are used in MYSQL?

Answer 1

I must do bitwise operation in the where clause, so I can't use index for it.

You answered your own question. If your query does not use an index, it means mysql will have to check every actual value stored to see if it matches, which will be a lot slower.

Answer 2

您已经回答了您的问题- so I can't use an index for it -是的，在大多数情况下，性能会受到损害。