pgadmin 连接来自 2 个不同表的字段

Question

我正在尝试在 pgadmin 中合并两个表中的数据。

我可以单独访问这两个表。

表 1：

SELECT candidateid ,date, "time", campaign_id,emailaddress, email_size, subject_length, email_length FROM dbo.learningtokenopenemail

表 2：

SELECT city, emailaddress, country FROM dbo.candidatedetails

将城市和国家/地区添加到表一的最简单方法是什么？

Answer 1

您可以加入emailaddress：

SELECT l.candidateid,
       l.date,
       l."time",
       l.campaign_id,
       l.emailaddress, 
       l.email_size,
       l.subject_length,
       l.email_length,
       c.city,
       c.country
FROM   dbo.learningtokenopenemail l
JOIN   dbo.candidatedetails c ON l.emailaddress = c.emailaddress