string-functions: add instructions for using ASCII() and BIN() #15481
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[APPROVALNOTIFIER] This PR is APPROVED This pull-request has been approved by: qiancai The full list of commands accepted by this bot can be found here. The pull request process is described here
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| `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。 | ||
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| - 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`。 |
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如果输入参数为空，该函数返回
0。
这里的空，其实是指空字符串。
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| - 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。 |
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“123q123”
这是中文引号，需要更新一下 "123q123"
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What is changed, added or deleted? (Required)
Fix pingcap/docs#15418
This PR adds instructions for the string functions ASCII() and BIN().
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