ORDER BY RAND() tampaknya kurang dari acak

RAND() hanya dijalankan sekali per kueri. Anda dapat memverifikasi ini dengan melihat kumpulan hasil.

Jika Anda mencoba untuk mendapatkan pesanan acak, Anda harus menggunakan NEWID() atau CHECKSUM(NEWID()) .

WITH T AS ( -- example using RAND()
  SELECT 'Me' Name UNION SELECT 'You' UNION SELECT 'Another'
)
SELECT Name, RAND()
FROM T;

WITH T AS ( -- example using just NEWID()
  SELECT 'Me' Name UNION SELECT 'You' UNION SELECT 'Another'
)
SELECT Name, NEWID()
FROM T;

WITH T AS ( -- example getting the CHECKSUM() of NEWID()
  SELECT 'Me' Name UNION SELECT 'You' UNION SELECT 'Another'
)
SELECT Name, CHECKSUM(NEWID())
FROM T;