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docs:add description for \x

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wangmm0220 2024-01-31 17:37:59 +08:00
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docs/en/12-taos-sql/18-escape.md
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@ -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(\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 "\_".
- 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 `_`.