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Update nullable.md
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Alex-Cheng authored Mar 7, 2024
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## null子列 {#finding-null}

It is possible to find `NULL` values in a column by using `null` subcolumn without reading the whole column. It returns `1` if the corresponding value is `NULL` and `0` otherwise.
通过使用`null`子列可以在列中查找`NULL`值,而无需读取整个列。如果对应的值为`NULL`,则返回`1`,否则返回`0`
通过使用 `null` 子列可以在列中查找 `NULL` 值,而无需读取整个列。如果对应的值为 `NULL`,则返回 `1`,否则返回 `0`

**示例**

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