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DB2® Database can implement a join in three ways using a merge join, a nested join or a hybrid join. Explain the differences?

April 26, 2017database differences explain hybrid implement join merge nested

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DB2® Database can implement a join in three ways using a merge join, a nested join or a hybrid join. Explain the differences?

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A241) A merge join requires that the tables being joined be in a sequence; the rows are retrieved with a high cluster ratio index or are sorted by DB2® Database. A nested join does not require a sequence and works best on joining a small number of rows. DB2® Database reads the outer table values and each time scans the inner table for matches. The hybrid join is a nested join that requires the outer table be in sequence.