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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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