Explain the difference between a SQL index and a primary key.

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

参考答案摘要

A primary key uniquely identifies a row, while an index is a data structure to speed up lookups. A primary key creates a unique index by default, but you can have many non-unique indexes on a table.

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