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Merge pull request #46833 from ClickHouse/rs/escaping-docs

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Rectify string literals escaping docs
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robot-ch-test-poll 2023-02-24 17:11:52 +01:00 committed by GitHub
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docs/en/sql-reference/syntax.md
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@ -83,9 +83,13 @@ Examples: `1`, `10_000_000`, `0xffff_ffff`, `18446744073709551615`, `0xDEADBEEF`
### String ### String
Only string literals in single quotes are supported. The enclosed characters can be backslash-escaped. The following escape sequences have a corresponding special value: `\b`, `\f`, `\r`, `\n`, `\t`, `\0`, `\a`, `\v`, `\xHH`. In all other cases, escape sequences in the format `\c`, where `c` is any character, are converted to `c`. It means that you can use the sequences `\'`and`\\`. The value will have the [String](../sql-reference/data-types/string.md) type. String literals must be enclosed in single quotes, double quotes are not supported.
Escaping works either
In string literals, you need to escape at least `'` and `\`. Single quotes can be escaped with the single quote, literals `'It\'s'` and `'It''s'` are equal. - in SQL-style based on a preceding single quote where the single-quote character `'` (and only this character) can be escaped as `''`, or
- in C-style based on a preceding backslash with the following supported escape sequences: `\\`, `\'`, `\b`, `\f`, `\r`, `\n`, `\t`, `\0`, `\a`, `\v`, `\xHH`. The backslash loses its special meaning and will be interpreted literally if it precedes characters different than the listed ones.
In string literals, you need to escape at least `'` and `\` using escape codes `''` (or: `\'`) and `\\`.
### Compound ### Compound