是否可以按ORDER BY RAND（）限制但包含标题？

Question

是否有可能从user表中返回随机选择的行，并将头包含为第一行？在SQL我目前所面对的只是返回5个随机行（不一定是头部）

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

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';