HASH indexes are optimized for equality comparisons, meaning they are fast for exact matches. However, they are not suitable for range queries, which is where BTREE indexes perform better.

The AUTO_INCREMENT attribute automatically increments the value of the column for each new row inserted. It is typically used for primary key columns.

MySQL Enterprise Firewall prevents SQL injection attacks by monitoring and blocking any queries that do not match known, legitimate SQL patterns. It learns from allowed queries and builds an allowlist for future query validation.

The CREATE USER privilege allows users to manage other user accounts, including creating, modifying, and dropping users. This privilege is typically granted to administrators.

An INNER JOIN returns only the rows that have matching values in both tables. If no match is found, the row is excluded from the result set.