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29 lines
1.2 KiB
Markdown
29 lines
1.2 KiB
Markdown
# Join {#join}
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加载好的 JOIN 表数据会常驻内存中。
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Join(ANY|ALL, LEFT|INNER, k1[, k2, ...])
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引擎参数：`ANY|ALL` – 连接修饰；`LEFT|INNER` – 连接类型。更多信息可参考 [JOIN子句](../../query_language/select.md#select-join)。
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这些参数设置不用带引号，但必须与要 JOIN 表匹配。 k1，k2，……是 USING 子句中要用于连接的关键列。
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此引擎表不能用于 GLOBAL JOIN 。
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类似于 Set 引擎，可以使用 INSERT 向表中添加数据。设置为 ANY 时，重复键的数据会被忽略（仅一条用于连接）。设置为 ALL 时，重复键的数据都会用于连接。不能直接对 JOIN 表进行 SELECT。检索其数据的唯一方法是将其作为 JOIN 语句右边的表。
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跟 Set 引擎类似，Join 引擎把数据存储在磁盘中。
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### Limitations and Settings {#join-limitations-and-settings}
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When creating a table, the following settings are applied:
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- join\_use\_nulls
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- max\_rows\_in\_join
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- max\_bytes\_in\_join
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- join\_overflow\_mode
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- join\_any\_take\_last\_row
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The `Join`-engine tables can’t be used in `GLOBAL JOIN` operations.
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[来源文章](https://clickhouse.tech/docs/en/operations/table_engines/join/) <!--hide-->
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