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sql: update ddl doc #686

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May 25, 2018
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sql: update ddl doc #686

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sql: update ddl doc
winkyao Apr 20, 2018
69a0225
address comment
winkyao Apr 27, 2018
7d6de04
sql: update ddl table_option description
lilin90 May 25, 2018
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7 changes: 4 additions & 3 deletions sql/ddl.md
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Expand Up @@ -288,11 +288,12 @@ table_option:
| ROW_FORMAT [=] {DEFAULT|DYNAMIC|FIXED|COMPRESSED|REDUNDANT|COMPACT}
| STATS_PERSISTENT [=] {DEFAULT|0|1}
```
`ALTER TABLE` 用于修改已存在的表的结构，比如：修改表及表属性、新增或删除列、创建或删除索引、修改列及属性等. 以下是几个字段类型的描述:

* `index_col_name`、`index_type` 和 `index_option` 可以参考 [CREATE INDEX 语法](#create-index-语法).
`ALTER TABLE` 用于修改已存在的表的结构，比如：修改表及表属性、新增或删除列、创建或删除索引、修改列及属性等。以下是几个字段类型的描述：

* `table_option` 目前支持都只是语法上支持。
* `index_col_name`、`index_type` 和 `index_option` 可以参考 [CREATE INDEX 语法](#create-index-语法)。

* `table_option` 目前支持的修改类型为 `AUTO_INCREMENT` 和 `COMMENT`，其它的只是语法上支持。

下面介绍一下具体操作类型的支持情况。

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