是否可以按 RAND() LIMIT 进行 ORDER BY RAND() LIMIT 但包含标题？答案

【问题标题】：Is it possible to do ORDER BY RAND() LIMIT but include the header?是否可以按 RAND() LIMIT 进行 ORDER BY RAND() LIMIT 但包含标题？
【发布时间】：2014-05-16 16:26:21
【问题描述】：

是否可以从user 表中返回随机选择的行并将标题作为第一行包含在内？我现在的 SQL 只返回 5 个随机行（不一定是标题）

SELECT
    'id',
    'name'
UNION ALL SELECT
    id,
    name

INTO OUTFILE 'example.txt'
    FIELDS TERMINATED BY ' , ' ENCLOSED BY '"' ESCAPED BY '\\' LINES TERMINATED BY '\r\n'

FROM
    users

ORDER BY RAND() LIMIT 5

【问题讨论】：

标签： mysql sql-limit

【解决方案1】：

试试这个


SELECT 'id','name'
UNION ALL 
Select a.* from(
    SELECT id, name
    FROM  users
    ORDER BY RAND() LIMIT 5
 )a
INTO OUTFILE 'example.txt'  FIELDS TERMINATED BY ','  ENCLOSED BY '"' ESCAPED BY '\\' LINES TERMINATED BY '\r\n';

【讨论】：