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SUBQ CONDITION FOR INDEX is one of the database system.

The database system canuse this search strategy if one of the following conditions is met:

  • For the first k columns of an index, the search condition contains equality or range conditions (1 <= k < n, where n is the number of indexed columns).

  • The search condition contains one equality condition for all columns of an index.

The values for the inversion list or index columns come from a subquery.

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