Is it necessary to consider the order of columns when creating composite indexes in a database?

Yes, the order of columns in a composite index matters. The index is created based on the sequence of the specified columns, and its effectiveness depends on how queries are formulated.

For example, if an index is created on columns (A, B), it is efficiently used for queries filtering by A or by both A and B. However, queries filtering only by B will not be able to use this index effectively.

Therefore, when designing composite indexes, it is important to consider which columns are most frequently used in WHERE conditions and in what order, so that the index maximally accelerates the necessary queries.