diff --git a/docs/en/12-taos-sql/18-escape.md b/docs/en/12-taos-sql/18-escape.md index a44b21db43..2d067b2ad9 100644 --- a/docs/en/12-taos-sql/18-escape.md +++ b/docs/en/12-taos-sql/18-escape.md @@ -7,14 +7,14 @@ description: This document describes the usage of escape characters in TDengine. | Escape Character | **Actual Meaning** | | :--------------: | ------------------------ | -| `\'` | Single quote ' | -| `\"` | Double quote " | -| \n | Line Break | -| \r | Carriage Return | -| \t | tab | -| `\\` | Back Slash \ | -| `\%` | % see below for details | -| `\_` | \_ see below for details | +| `\'` | Single quote `'` | +| `\"` | Double quote `"` | +| `\n` | Line Break | +| `\r` | Carriage Return | +| `\t` | tab | +| `\\` | Back Slash `\ ` | +| `\%` | `%` see below for details | +| `\_` | `_` see below for details | ## Restrictions @@ -22,5 +22,5 @@ description: This document describes the usage of escape characters in TDengine. - Identifier without ``: Error will be returned because identifier must be constituted of digits, ASCII characters or underscore and can't be started with digits - Identifier quoted with ``: Original content is kept, no escaping 2. If there are escape characters in values - - The escape characters will be escaped as the above table. If the escape character doesn't match any supported one, the escape character "\" will be ignored. - - "%" and "\_" are used as wildcards in `like`. `\%` and `\_` should be used to represent literal "%" and "\_" in `like`,. If `\%` and `\_` are used out of `like` context, the evaluation result is "`\%`"and "`\_`", instead of "%" and "\_". + - The escape characters will be escaped as the above table. If the escape character doesn't match any supported one, the escape character `\ ` will be ignored(`\x` remaining). + - `%` and `_` are used as wildcards in `like`. `\%` and `\_` should be used to represent literal `%` and `_` in `like`. If `\%` and `\_` are used out of `like` context, the evaluation result is `\%` and `\_`, instead of `%` and `_`. diff --git a/docs/zh/12-taos-sql/18-escape.md b/docs/zh/12-taos-sql/18-escape.md index 5e0d292d39..81e4179042 100644 --- a/docs/zh/12-taos-sql/18-escape.md +++ b/docs/zh/12-taos-sql/18-escape.md @@ -8,16 +8,15 @@ description: TDengine 中使用转义字符的详细规则 | 字符序列 | **代表的字符** | | :------: | -------------- | -| `\'` | 单引号' | -| `\"` | 双引号" | -| \n | 换行符 | -| \r | 回车符 | -| \t | tab 符 | -| `\\` | 斜杠\ | -| `\%` | % 规则见下 | -| `\_` | \_ 规则见下 | +| `\'` | 单引号`'` | +| `\"` | 双引号`"` | +| `\n` | 换行符 | +| `\r` | 回车符 | +| `\t` | tab 符 | +| `\\` | 斜杠 `\ ` | +| `\%` | `%` 规则见下 | +| `\_` | `_` 规则见下 | -::: ## 转义字符使用规则 @@ -25,5 +24,5 @@ description: TDengine 中使用转义字符的详细规则 1. 普通标识符: 直接提示错误的标识符,因为标识符规定必须是数字、字母和下划线,并且不能以数字开头。 2. 反引号``标识符: 保持原样,不转义 2. 数据里有转义字符 - 1. 遇到上面定义的转义字符会转义(%和\_见下面说明),如果没有匹配的转义字符会忽略掉转义符\。 - 2. 对于%和\_,因为在 like 里这两个字符是通配符,所以在模式匹配 like 里用`\%`%和`\_`表示字符里本身的%和\_,如果在 like 模式匹配上下文之外使用`\%`或`\_`,则它们的计算结果为字符串`\%`和`\_`,而不是%和\_。 + 1. 遇到上面定义的转义字符会转义(`%`和`_`见下面说明),如果没有匹配的转义字符会忽略掉转义符`\ `(`\x`保持原样)。 + 2. 对于`%`和`_`,因为在`like`里这两个字符是通配符,所以在模式匹配`like`里用`\%`和`\_`表示字符里本身的`%`和`_`,如果在`like`模式匹配上下文之外使用`\%`或`\_`,则它们的计算结果为字符串`\%`和`\_`,而不是`%`和`_`。