Have you ever worked with using composite indexes in a database?

Yes, composite (concatenated) indexes are indexes created on multiple columns of a database table. They help speed up queries that filter or sort data based on several fields simultaneously.

For example, in SQL Server or MySQL, you can create an index on two columns:

CREATE INDEX idx_name ON table_name (column1, column2);

Using composite indexes helps optimize queries with conditions like WHERE column1 = ? AND column2 = ?.

It is important to consider the order of columns in the index, as it affects the efficiency of index usage in different queries.