How can we use IN/EXIST operator in Hive?

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Can anyone explain how we can use IN/EXIST operator in Hive?
Jun 19 in Big Data Hadoop by Sanju
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1 answer to this question.

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Hey,

Yes, now Hive supports IN or EXIST, operators. Also, you can use left semi join here. Left Semi Join performs the same operation IN do in SQL.

So if you have the below query in SQL-

SELECT a.key, a.value
FROM a
WHERE a.key in
(SELECT b.key
FROM B);

Then the suitable query for the same in Hive can be-

SELECT a.key, a.val
FROM a LEFT SEMI JOIN b on (a.key = b.key)

Both will fulfill the same purpose.

answered Jun 19 by Gitika
• 19,720 points

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