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This article will explain in detail how to achieve column switching in hive. The editor thinks it is very practical, so I share it with you as a reference. I hope you can get something after reading this article.

First, problems

How does hive put

A b 1

A b 2

A b 3

C d 4

C d 5

C d 6

Change to:

A b 1,2,3

C d 4,5,6

2. Data

Test.txt

A b 1

A b 2

A b 3

C d 4

C d 5

C d 6

3. Answer

1. Build a table

Drop table tmp_jiangzl_test

Create table tmp_jiangzl_test

(

Col1 string

Col2 string

Col3 string

)

Row format delimited fields terminated by'\ t'

Stored as textfile

Load data local inpath'/ home/jiangzl/shell/test.txt' into table tmp_jiangzl_test

two。 Deal with

Select col1,col2,concat_ws (',', collect_set (col3))

From tmp_jiangzl_test

Group by col1,col2

This is the end of the article on "how to realize column switching in hive". I hope the above content can be helpful to you, so that you can learn more knowledge. if you think the article is good, please share it for more people to see.

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