Explain primary key and it's importance.

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: Data Analyst

参考答案摘要

A primary key serves as a unique identifier for records in a database table, promoting data integrity and preventing duplicates. This important element enhances data retrieval efficiency, supports ind...

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