目录引言1. 场景举例2. 方法一：UNION ALL + GROUP BY（推荐）特点3. 方法二：FULL OUTER JOIN特点4. 方法三：合并多个临时表（通用模板）5. 性能对比与优化建议6. 总结引言
In couchdb website -> technical overview -> security and validation - http://couchdb.apache.org/docs/overview.html - it writes that (on reader access
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