What is the difference between **UNION** and **UNION ALL

What is the difference 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: medium

标签: intellipaat, sql, topic-specific, sql, database

参考答案摘要

UNION removes duplicate records, whereas UNION ALL includes all records, including duplicates. | Feature | UNION | UNION ALL | | --- | --- | --- | | Duplicate Rows | Removed | Included | | Performance...

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