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# AggregatingMergeTree
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# AggregatingMergeTree
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The engine inherits from [MergeTree](mergetree.md#table_engines-mergetree), altering the logic for data parts merging. ClickHouse replaces all rows with the same primary key with a single row (within a one data part) that stores a combination of states of aggregate functions.
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The engine inherits from [MergeTree](mergetree.md#table_engines-mergetree), altering the logic for data parts merging. ClickHouse replaces all rows with the same primary key with a single row (within a one data part) that stores a combination of states of aggregate functions.
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You can use `AggregatingMergeTree` tables for incremental data aggregation, including for aggregated materialized views.
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You can use `AggregatingMergeTree` tables for incremental data aggregation, including for aggregated materialized views.
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