Which of these comparisons is slowest?

Answer: Option B

This question is about how MySQL compares different data types.
We have four options:
Option A: INT/INT - Comparing two integer values (INT).
Option B: INT/BIGINT - Comparing an integer value (INT) with a larger integer value (BIGINT).
Option C: BIGINT/BIGINT - Comparing two larger integer values (BIGINT).
Option D: All are of same speed - This means all the comparison types have the same speed.
The answer is Option B.
Here's why:
MySQL needs to convert the smaller data type (INT) to the larger data type (BIGINT) to perform the comparison. This conversion takes extra time, making it the slowest comparison.
In Options A and C, both values are the same data type, so no conversion is needed, leading to faster comparisons.
In summary, comparing different data types involves an extra step, which slows down the process. So, comparing an INT with a BIGINT is the slowest option.