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union all对查询结果为NULL的不会去重,对于查询条件查询结果为null 的union all查询,结果为NULL会去重;_Zhang …

SQL join using UNION ALL with some columns common and some outer …

MySQL UNION ALL | Syntax | Examples to Implement

MySQL UNION ALL | Syntax | Examples to Implement

SQL SERVER – How to Retrieve TOP and BOTTOM Rows Together using T-SQL …

SQL UNION ALL

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