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mysql随机取数据

SELECT * FROM sys_dict_data ORDER BY RAND() LIMIT 10;

此方法可以用在随机抽取题库场景

Mysql变量应用

-- 菜单 SQL
insert into sys_menu (menu_name, parent_id, order_num, path, component, is_frame, is_cache, menu_type, visible, status, perms, icon, create_by, create_time, update_by, update_time, remark)
values('题库管理', '2000', '1', 'question', 'evaluate/question/index', 1, 0, 'C', '0', '0', 'evaluate:question:list', '#', 'admin', sysdate(), '', null, '题库菜单');
-- 按钮父菜单ID
SELECT @parentId := LAST_INSERT_ID();
-- 按钮 SQL
insert into sys_menu (menu_name, parent_id, order_num, path, component, is_frame, is_cache, menu_type, visible, status, perms, icon, create_by, create_time, update_by, update_time, remark)
values('题库查询', @parentId, '1',  '#', '', 1, 0, 'F', '0', '0', 'evaluate:question:query',        '#', 'admin', sysdate(), '', null, '');