Join Indexes and Base Tables - Teradata Vantage

In most respects, a join index is similar to a base table. For example, you can do the following things to a join index:

• Create nonunique secondary indexes on its columns.
• Create a unique primary index on its columns, if the index is a non-compressed and nonvalue-ordered single-table join index.
• Run COLLECT STATISTICS, DROP STATISTICS, HELP, and SHOW statements.
• Partition its primary index, if the index is a noncompressed join index.

Unlike base tables, you cannot do the following things with join indexes:

• Query or update join index rows explicitly.
• Store and maintain arbitrary query results such as expressions.
  You can maintain aggregates or sparse indexes if you define the join index to do so.