27 lines
1.4 KiB
Markdown
27 lines
1.4 KiB
Markdown
---
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title: Escape Characters
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description: This document describes the usage of escape characters in TDengine.
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---
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## Escape Characters
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| Escape Character | **Actual Meaning** |
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| :--------------: | ------------------------ |
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| `\'` | Single quote ' |
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| `\"` | Double quote " |
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| \n | Line Break |
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| \r | Carriage Return |
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| \t | tab |
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| `\\` | Back Slash \ |
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| `\%` | % see below for details |
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| `\_` | \_ see below for details |
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## Restrictions
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1. If there are escape characters in identifiers (database name, table name, column name)
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- Identifier without ``: Error will be returned because identifier must be constituted of digits, ASCII characters or underscore and can't be started with digits
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- Identifier quoted with ``: Original content is kept, no escaping
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2. If there are escape characters in values
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- 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.
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- "%" 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 "\_".
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