Write a SQL query to find and remove duplicate records from a table.

Write a SQL query to find and remove duplicate records from a table.

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: medium

标签: interviewbit, data-analyst, topic-specific, data-analysis, analytics

参考答案摘要

To find duplicates, I usually start with GROUP BY and HAVING. SELECT email, COUNT(*) FROM customers GROUP BY email HAVING COUNT(*) > 1; This shows which email values appear more than once. To inspect ...

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