hive isnull
时间: 2023-08-28 14:22:33 浏览: 219
Hive SQL性能优化
The `ISNULL` function in Hive is used to check if a column or expression is null. It returns true if the value is null, and false otherwise. Here's an example usage:
```sql
SELECT *
FROM table_name
WHERE column_name IS NULL;
```
This query will retrieve all rows from the table where the specified column is null.
阅读全文