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

Question

是否可以从表中返回随机选择的行user并将标题作为第一行包含在内？我目前拥有的 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

Answer 1

尝试这个

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';