为了避免在未来遇到“_merge already defined”的错误,你可以遵循以下建议: 每次合并后清理_merge变量: 每次完成数据合并后,根据你的需要决定是否保留_merge变量。如果不需要,立即删除它。 使用脚本或程序时小心合并操作: 在编写数据处理脚本或程序时,确保合并操作是逻辑上连贯的,并且每次合并后都适当地处理_merge变量。
merge (变量名) using (文件名), keep((变量名)) [第一个变量名即为前面sort后面的变量名,文件名是辅助数据库的名字,后面的变量名是希望提取的变量名] ta _merge [显示_merge的取值情况。_merge等于1的观察是仅主库有的,等于2的是仅辅助库有的,等于3是两个库都有的。] drop if _merge==2 [删除仅仅...
Subject: st: merge command when variable already defined I have a variable that contains values for most of my dataset. I would like to add values where it is presently undefined by match merging with another dataset. However, this does not work since the variable is already defined. The on...