What's the purpose of this below query?

What's the purpose of this below query?

题目类型: 技术面试题

这是一道技术面试题，常见于澳洲IT公司面试中。

难度: hard

标签: interviewbit, teradata, topic-specific, data-warehouse

参考答案摘要

SELECT HASHMAP (HASHBUCKET(HASHROW(emp_id))), COUNT(*) FROM Employee GROUP BY 1; With the above query, you can determine the number of rows in each AMP for a given database table. HASHAMP, HASHBUCKET,...

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