What is a correlated subquery, and when is slower than a JOIN

What is a correlated subquery, and when is slower than a JOIN

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, dbms, topic-specific, database

参考答案摘要

A correlated subquery is a subquery that depends on values from the outer query. It runs once for each row returned by the main query. Because of this repeated execution, it can be slow on large datas...

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