文章浏览阅读140次。文章目录分组聚合 GROUP_CONCAT()分组聚合 GROUP_CONCAT()使用总结SELECT emp_id, first_name, last_name, dep_id, GROUP_CONCAT( quality ) as "qualities" FROM Employee group by emp_id;参考连接1 https://www.educative.io/edpresso/what-is-the-groupcon......
1 查看Oracle性能参数select view_definition from v$fixed_view_definition where view_name = 'V$PARAMETER';select view_definition from v$fixed_view_definition where view_name = 'GV$PARAMETER';select NUM , NAME , TYPE , VALUE , DISPLAY_VALUE, ISDEFAULT , ISSES__mysql dba常用sql...