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* replace exit with assert in test_single_page * improve save_raw_single_page docs option * More grammar fixes * "Built from" link in new tab * fix mistype * Example of include in docs * add anchor to meeting form * Draft of translation helper * WIP on translation helper * Replace some fa docs content with machine translation * add normalize-en-markdown.sh * normalize some en markdown * normalize some en markdown * admonition support * normalize * normalize * normalize * support wide tables * normalize * normalize * normalize * normalize * normalize * normalize * normalize * normalize * normalize * normalize * normalize * normalize * normalize * lightly edited machine translation of introdpection.md * lightly edited machhine translation of lazy.md * WIP on translation utils * Normalize ru docs * Normalize other languages * some fixes * WIP on normalize/translate tools * add requirements.txt * [experimental] add es docs language as machine translated draft * remove duplicate script * Back to wider tab-stop (narrow renders not so well)
1.2 KiB
1.2 KiB
Join
加载好的 JOIN 表数据会常驻内存中。
Join(ANY|ALL, LEFT|INNER, k1[, k2, ...])
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。
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。
此引擎表不能用于 GLOBAL JOIN 。
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。
跟 Set 引擎类似，Join 引擎把数据存储在磁盘中。
Limitations and Settings
When creating a table, the following settings are applied:
- join_use_nulls
- max_rows_in_join
- max_bytes_in_join
- join_overflow_mode
- join_any_take_last_row
The Join-engine tables can’t be used in GLOBAL JOIN operations.