From https://www.h2database.com/html/performance.html:

This database uses indexes to improve the performance ofSELECT, UPDATE,
DELETE. If a column is used in the WHERE clause of a query, and if an
index exists on this column, then the index can be used. Multi-column
indexes are used if all or the first columns of the index are used.Both
equality lookup and range scans are supported.Indexes are used to order
result sets, but only if the condition uses the same index or no index
at all.The results are sorted in memory if required. Indexes are
created automatically for primary key and unique constraints. Indexes
are also created for foreign key constraints, if required. For other
columns, indexes need to be created manually using the CREATE INDEX
statement. 

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