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This article mainly shows you "how to add and query constant columns in hive". The content is simple and clear. I hope it can help you solve your doubts. Let me lead you to study and learn this article "how to add and query constant columns in hive".

In normal application scenarios, a DATAFRAME is often obtained directly from Hive. In addition to the extraction of some fields in the data table, this dataframe often involves the addition of some constant columns, such as distinguishing data and other scenarios.

This feature is natively provided in hive. It's simple.

Such as this statement: select *, 1a, 24 hours from * *. It is realized to add two fields an and hours after the original word column of a table. And the values of both fields are constant.

The effect is as follows:

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