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Asked: 2026-05-29T10:47:37+00:00

create table foo (id, name, col1, col2, col3, ..); create index index_name on foo

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create table foo (id, name, col1, col2, col3, ..);
create index index_name on foo (col1, col2, col3 desc);

How do I know if it has been created in the descending option and how to verify if queries on foo are really using this index?

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  1. Editorial Team

    You can’t create a multi column index with descending option.

    The DESC is parsed but ignored.

    From MySQL Docs: CREATE INDEX syntax:

    An index_col_name specification can end with ASC or DESC. These keywords are permitted for future extensions for specifying ascending or descending index value storage. Currently, they are parsed but ignored; index values are always stored in ascending order.

    As for seeing what index is used in queries, you should look into the EXPLAIN statement which makes it easy to see which indices are used in a particular query.

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