What is the difference between bigint and int in MySQL?

In MySQL, bigint and int are both integer data types, but they have some differences between them.

1. Storage size: bigint occupies 8 bytes (64 bits), while int occupies 4 bytes (32 bits). Therefore, bigint can store a larger range of integers, ranging from -9,223,372,036,854,775,808 to 9,223,372,036,854,775,807, while int’s range is from -2,147,483,648 to 2,147,483,647.
2. Performance: In situations where a large amount of data storage and processing is involved, the performance of integer may be better than bigint due to the larger storage space consumption of bigint. In certain scenarios, using integer can enhance the efficiency of queries and indexes.
3. Use cases: bigint is suitable for scenarios that require storage of very large integer values, such as storing IDs, order numbers, etc.; while int is suitable for general integer data storage.

In summary, the main difference between bigint and int lies in their storage size and suitable scenarios. Bigint can store a larger range of integer values but may require more storage space. When deciding which type to use, it is important to consider the actual needs and size of the data.