Can you explain the difference between a UNION and a UNION ALL in SQL?

Can you explain the difference between a UNION and a UNION ALL in SQL?

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: easy

标签: interviewbit, publicis-sapient, company-specific

目标公司: Publicis Sapient

参考答案摘要

In SQL, the UNION and UNION ALL clauses are used to combine the results of two or more SELECT statements into a single result set. However, they are used in slightly different ways and serve different...

本题提供 STAR 原则详细解答和技术解析，登录匠人学院学习中心即可查看完整答案。