怎么学都是菜的博客例如 一个用户下 储存 phone 表的 字段id 123,456,789 做关联查询 并将多数据合并成一条查出 手机号 备忘录 SELECT GROUP_CONCAT(substring_index(d.phoneNumber,',',1)) as photo FROM user a left join phone ...
JAVA——Y的博客// 以id分组,把name字段的值...关键字:group_concat separator :分隔符 CONCAT():用于将多个字符串连接成一个字符串 select id,group_concat(name separator ';') from table group by id // 一个字段有...
culi4814的博客SQL vs NoSQL: The Differences, I mentioned the line between SQL and NoSQL databases has become increasingly blurred with each camp adopting features from the ... MySQL 5.7 InnoDB and PostgreSQL 9.4...