SUBQ CONDITION FOR INDEX is a search strategy of the SQL Optimizer.

This search strategy can be selected in the following cases:

?     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 index 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.

See also:

Equality Condition

Range Condition

Search Conditions for Indexed Columns

List of All Search Strategies