What type were subpartitions when range partitioning by month?

When range partitioning by month, subpartitions are usually made by LIST or HASH type, depending on the requirements. For example, if the main partitioning is RANGE by months, then subpartitioning can be by LIST for specific data categories or by HASH for uniform distribution within each range.

This allows for more flexible data management and query optimization by combining the advantages of different partitioning types.