知乎专栏 | 多维度架构 |
SELECT tags FROM neo.article; linux redis mysql java php
tags字段专为一行显示
SELECT group_concat(tags) FROM neo.article; linux,redis,mysql,java,php
distinct 去除重复数据
select group_concat(distinct author) from neo.article;
以id分组,把name字段的值打印在一行,分号分隔
select id,group_concat(tags separator ';') from neo.article group by tags;
排序结果
select group_concat(distinct author order by author desc) from neo.article;