PostgreSQL DISTINCT 关键字。耳边二货

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内容图文

在 PostgreSQL 中，DISTINCT 关键字与 SELECT 语句一起使用，用于去除重复记录，只获取唯一的记录。

我们平时在操作数据时，有可能出现一种情况，在一个表中有多个重复的记录，当提取这样的记录时，DISTINCT 关键字就显得特别有意义，它只获取唯一一次记录，而不是获取重复记录。

语法
用于去除重复记录的 DISTINCT 关键字的基本语法如下：

SELECT DISTINCT column1, column2,.....columnN
FROM table_name
WHERE [condition]
实例
创建 COMPANY 表（下载 COMPANY SQL 文件 ），数据内容如下：
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