内联接输出中的重复

Question

我正在PostgreSQL中加入两个表。一个表格是我的原始adwords数据（adwords_final。）。第二个表格只是对需要报告的“广告系列”列的引用。这些引用仅在每个广告系列中发生一次，而adwords数据包含每个广告系列的多个条目，因为存在日期因素/列。

我使用以下查询将其输出到csv文件

COPY (SELECT * FROM adwords_final INNER JOIN mk_kw ON "mk_kw"."Key"  =  "adwords_final"."Key") TO 'C:\Users\iantu\Desktop\Performance Marketing\Report Outputs\adwords_final.csv' WITH CSV HEADER;

问题是我的新csv文件包含很多重复项。我在这里使用正确的命令还是应该转换为循环？

adwords final中的列;

Week    Keyword state   Keyword Campaign    Ad group    Status  Max. CPC    Impressions Interactions    Interaction Types   Interaction Rate    Avg. Cost   Cost    Clicks  Avg. position   Conversions Quality score   Ad relevance    Landing page experience Expected clickthrough rate  Qual. score (hist.) Ad relevance (hist.)    Landing page experience (hist.) Expected clickthrough rate (hist.)  Search Impr. share  Match type  First position CPC  Top of page CPC First page CPC  Impressions with average ctr    Impressions with above average ctr  Impressions with below average ctr  Impressions with below average lp exp   Impressions with average lp exp Impressions with above average lp exp   Impressions with below average Ad Rel   Impressions with  average ad rel    Impressions with above average ad rel   QSxIMP  Key

mk_kw中的列

 Language   Network Main Keyword    Cluster Keyword 1   Match Type  Key

由于

Answer 1

FROM 'C:\Users\iantu\Desktop\Performance Marketing\Report 
Outputs\adwords_final.csv' DELIMITER ',' CSV HEADER encoding 'windows-1251';
COPY (SELECT DISTINCT * FROM adwords_final LEFT JOIN mk_kw ON "mk_kw"."Key"  =  
"adwords_final"."Key") TO 'C:\Users\iantu\Desktop\Performance Marketing\Report 
Outputs\adwords_final.csv' WITH CSV HEADER;