Distinguish between UNION and UNION ALL.

Distinguish between UNION and UNION ALL.

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, capgemini, company-specific

目标公司: Capgemini

参考答案摘要

To aggregate the results of two or more SQL SELECT queries, we use the SQL UNION method. In the union operation, the number of data types and columns in both tables on which the UNION action is perfor...

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。