ORDER BY RAND

SELECT title FROM bookmarks ORDER BY RAND() LIMIT 10;

SELECT t.*
FROM (
SELECT ROUND(RAND() * (
SELECT MAX(id)
FROM bookmarks)) num, @num:=@num+1
FROM (
SELECT @num:=0) AS a, bookmarks
LIMIT 10) AS b, bookmarks AS t
WHERE b.num = t.id;

SELECT * FROM bookmarks ORDER BY crc32(concat(CURRENT_TIMESTAMP, id)) LIMIT 10

SELECT a1.* FROM bookmarks a1
    JOIN (SELECT id FROM bookmarks a2 ORDER BY RAND() LIMIT 10) aj
WHERE a1.id = aj.id