ClickHouse/docs/zh/operations/system-tables/table_engines.md
2020-06-22 11:45:22 +03:00

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# 系统。表\_engines {#system-table-engines}
包含服务器支持的表引擎的描述及其功能支持信息。
此表包含以下列(列类型显示在括号中):
- `name` (String) — The name of table engine.
- `supports_settings` (UInt8) — Flag that indicates if table engine supports `SETTINGS` 条款
- `supports_skipping_indices` (UInt8) — Flag that indicates if table engine supports [跳过索引](../../engines/table-engines/mergetree-family/mergetree.md#table_engine-mergetree-data_skipping-indexes).
- `supports_ttl` (UInt8) — Flag that indicates if table engine supports [TTL](../../engines/table-engines/mergetree-family/mergetree.md#table_engine-mergetree-ttl).
- `supports_sort_order` (UInt8) — Flag that indicates if table engine supports clauses `PARTITION_BY`, `PRIMARY_KEY`, `ORDER_BY``SAMPLE_BY`.
- `supports_replication` (UInt8) — Flag that indicates if table engine supports [数据复制](../../engines/table-engines/mergetree-family/replication.md).
- `supports_duduplication` (UInt8) — Flag that indicates if table engine supports data deduplication.
示例:
``` sql
SELECT *
FROM system.table_engines
WHERE name in ('Kafka', 'MergeTree', 'ReplicatedCollapsingMergeTree')
```
``` text
┌─name──────────────────────────┬─supports_settings─┬─supports_skipping_indices─┬─supports_sort_order─┬─supports_ttl─┬─supports_replication─┬─supports_deduplication─┐
│ Kafka │ 1 │ 0 │ 0 │ 0 │ 0 │ 0 │
│ MergeTree │ 1 │ 1 │ 1 │ 1 │ 0 │ 0 │
│ ReplicatedCollapsingMergeTree │ 1 │ 1 │ 1 │ 1 │ 1 │ 1 │
└───────────────────────────────┴───────────────────┴───────────────────────────┴─────────────────────┴──────────────┴──────────────────────┴────────────────────────┘
```
**另请参阅**
- 梅树家族 [查询子句](../../engines/table-engines/mergetree-family/mergetree.md#mergetree-query-clauses)
- 卡夫卡 [设置](../../engines/table-engines/integrations/kafka.md#table_engine-kafka-creating-a-table)
- 加入我们 [设置](../../engines/table-engines/special/join.md#join-limitations-and-settings)