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string-functions: update ASCII() and BIN() #16120

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Jan 21, 2024
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string-functions: update ASCII() and BIN() #16120

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4 changes: 2 additions & 2 deletions functions-and-operators/string-functions.md
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Expand Up @@ -16,7 +16,7 @@ TiDB 支持使用大部分 MySQL 5.7 中提供的[字符串函数](https://dev.m
`ASCII()` 函数用于获取输入的参数中最左字符的 ASCII 值。该参数可以为字符串或数字。

- 如果输入参数不为空，该函数返回参数中最左字符的 ASCII 值。
- 如果输入参数为空，该函数返回 `0`。
- 如果输入参数为空字符串，该函数返回 `0`。
- 如果输入参数为 `NULL`，该函数返回 `NULL`。

> **注意：**
Expand Down Expand Up @@ -63,7 +63,7 @@ SELECT ASCII(23);
- 如果输入参数为负数，该函数会将该参数的绝对值转换为其二进制值，然后对二进制值的每位取反（`0` 变为 `1`，`1` 变为 `0`），最后加上 `1`。
- 如果输入参数为字符串，且该字符串中只包含数字，该函数将按照该数字返回结果。例如，`"123"` 与 `123` 的返回结果相同。
- 如果输入参数为字符串，且该字符串第一个字符不是数字（如 `"q123"`），该函数返回 `0`。
- 如果输入参数为字符串，且该字符串由数字和非数字组成，该函数将按照该参数中最前面连续的数字返回结果。例如，`“123q123”` 与 `123` 的返回结果相同。
- 如果输入参数为字符串，且该字符串由数字和非数字组成，该函数将按照该参数中最前面连续的数字返回结果。例如，`"123q123"` 与 `123` 的返回结果相同。
- 如果输入参数为 `NULL`，该函数返回 `NULL`。

示例：
Expand Down