如何在表PostgreSQL之间复制数据 [英] How do I copy data between tables PostgreSQL

问题描述

我有两个表：account_company和document_invoice。
表account_company有2列：company_id和company_name。
表document_invoice具有相同的列：company_id和company_name。
发生了什么事，并从document_invoice的列公司名称中删除了所有数据。

I have two tables: account_company and document_invoice. Table account_company has 2 columns: company_id and company_name. Table document_invoice has the same columns: company_id and company_name. Something happened and delete all data from column company name from document_invoice.

我如何编写SQL查询以将帐户公司表中的数据复制到document_invoice？
我一直在使用UPDATE和SET，但我不知道具体如何。

How can I write SQL query to copy data from account company table to document_invoice? I have been using UPDATE and SET but I don't know exactly how.

UPDATE document_invoice
   SET company_name = (SELECT company_name FROM account_company)
 WHERE document_id.company_name=document_id.account

推荐答案

这应该有效：

UPDATE document_invoice t1 
SET company_name = t2.company_name
FROM account_company t2 
WHERE t1.company_id = t2.company_id

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